1975           I                 United States 30             Pennsylvania 13
1976           II                Pennsylvania 36             United States 17
1977           III               Pennsylvania 29             United States 26
1978           IV              United States 26             Pennsylvania 26
1979           V               Pennsylvania 30             United States 18
1980           VI              United States 26             Pennsylvania 21
1981           VII             Pennsylvania 22             United States 19
1982           VIII            United States 24             Pennsylvania 19
1983           IX              Pennsylvania 27             United States 16
1984           X                Pennsylvania 31             United States 15
1985           XI              Pennsylvania 29             United States 13
1986           XII             Pennsylvania 25             United States 17
1987           XIII            Pennsylvania 21             United States 20
1988           XIV            Pennsylvania 27             United States 13
1989           XV             United States 31             Pennsylvania 16
1990           XVI            Pennsylvania 39             United States 9
1991           XVII           Pennsylvania 24             United States 22
1992           XVIII          United States 25             Pennsylvania 20
1993           XIX            United States 30             Pennsylvania 15
1994           XX             United States 36             Pennsylvania 18
1995           XXI            Pennsylvania 24             United States 18
1996           XXII           United States 38             Pennsylvania 12
1997           XXIII          United States 36             Pennsylvania 15
1998           XXIV         United States 23             Pennsylvania 19
1999           XXV            Pennsylvania 27             United States 19
2000           XXVI         Pennsylvania 34             United States 12
2001           XXVII        United States 31             Pennsylvania 19
2002           XXVIII       United States 26             Pennsylvania 21
2003           XXIX         United States 48             Pennsylvania 7
2004           XXX           Unites States 35             Pennsylvania 9
2005           XXXI         United States 39             Pennsylvania 6
2006           XXXII        United States 31             Pennsylvania 15
2007           XXXIII       United States 22             Pennsylvania 21
2008           XXXIV       United States 28             Pennsylvania 12
2009           XXXV        Pennsylvania 30             United States 21
2010           XXXVI       United States 30             Pennsylvania 13
2011           XXXVII      Pennsylvania 27             United States 18
2012           XXXVIII     United States 34             Pennsylvania 9
2013           XXXIX       United States 32             Pennsylvania 18
2014           XXXX        United States 25             Pennsylvania 16
2015           XXXXI       United States 31             Pennsylvania 14
2016           XXXXII      United States 25             Pennsylvania 15
2017           XXXXIII     United States 28             Pennsylvania 20
2018           XLIV          United States 23             Pennsylvania 21
2019           XLV           United States 29             Pennsylvania 18 
2020           XLVI          Not contested due to COVID
2021           XLVI          Pennsylvania 27             United States 23
2022           XLVI          United States 25             Pennsylvania 21
2023           XLIX          United States 33             Pennsylvania 9



Below are the first year results. 




Another source of details on the history of the Classic can be found at 
https://www.flowrestling.org/articles/5041227-all-time-pittsburgh-wrestling-classic-results