647
1971
942
20.9
1972
1090
21.9
1973
1060
23.6
1974
1090
17.9
1975
990
22.4
1976
863
18.0
1977
1370
19.8
1978
1130
24.6
1979
754
24.1
1980
1070
21.4
1981
1080
21.0
1982
736
19.80
1983
1240
24.8
1984
1190
20.7
1985
1040
22.5
1986
1700
21.9
1987
740
29.1
1988
1170
19.6
1989
1000
32.7
1991
822
24.7
1992
939
20.3
1993
1010
25.9
1994
1360
21.0
1995
1280
19.8
1996
1380
21.7
1997
1120
21.1
1998
2130
20.5
1999
1710
17.9
2001
1570
19.4
2002
1440
194
2004
1390
19.9
2005
1480
22.0
2006
1940
28.8



