"year","total_abundance" 1977,487 1978,992 1979,658 1980,1375 1981,1417 1982,1964 1983,1652 1984,951 1985,1416 1986,922 1987,1668 1988,1457 1989,1562 1990,1296 1991,1332 1992,1008 1993,714 1994,615 1995,1180 1996,1689 1997,2492 1998,1590 1999,1108 2000,1509 2001,1540 2002,2192