The planned mintages for 1/2 oz silver pandas as given in "Album of Precious Metal Commememrative Coins of The Peoples' Republisc of China" edited by China Gold Coin Inc:
1993 128,888
1994 158,888
1995 No limit
1996 No limit
1997 No limit
1998 200,000
1997 H.K. 30,000
1998 H.K. 30,000
IMO, the actual mintage may be much lower. 1994 was the most expensive one before 2009, but not in the last 12 months. Currently, 1998 is the most expensive one. 1995 small date (Shenyang Mint) is also hard to find.
exchange,
Can you check your 1997 sheet ? The position of date may be slightly different even the coins are in the same sheet.