Year	Number
1971	1639
1972	1654
1973	1683
1974	1692
1975	1698
1976	1692
1977	1663
1978	1623
1979	1588
1980	1535
1981	1509
1982	1488
1983	1493
1984	1456
1985	1440
1986	1411
1987	1363
1988	1288
1989	1266
1990	1227
1991	1212
1992	1200
1993	1190
1994	1166
1996	1134
1997	1170
2000	1249
2004	1445
2008	1573
2009	1568
2010	1577
2011	1563
2012	1574
2013	1536
2014	1555
2015	1610
2018	1698
2019	1653
2020	1603
2021	1558
2022	1503