Year	Number
1972	39025
1973	23720
1974	17512
1975	16892
1976	15210
1977	12815
1978	9725
1979	11994
1980	35329
1981	46677
1982	49870
1983	64546
1984	67616
1985	65107
1999	67126
2000	59552
2002	41926
2003	32189
2004	32195