Year	Number
1977	1275
1978	1357
1979	1439
1980	1508
1981	1554
1982	1577
1983	1582
1984	1580
1985	1582
1986	1604
1987	1645
1988	1699
1989	1758
1990	1846
1991	1984
1992	2098
1993	2023
1994	1935
1995	1909
1996	1855
1997	1823
1998	1826
1999	1862
2000	1889
2001	1903
2002	1910
2003	1896
2004	1845
2005	1772
2006	1698
2007	1633
2008	1575
2009	1522
2010	1475
2011	1430
2012	1390
2013	1355
2014	1320
2015	1286
2016	1254
2017	1221
2018	1193
2019	1165
2020	1136
2021	1106
2022	1075