Year	Number
1972	147121
1973	141911
1974	138891
1975	136564
1976	135648
1977	134065
1978	131747
1979	130319
1980	127749
1981	123301
1982	121657
1983	119854
1984	115636
1985	111008
1986	105445
1987	98968
1988	92257
1989	85962
1990	80228
1991	76013
1992	71059
1993	64265
1994	55672
1995	47633
1996	41993
1997	37664
1998	34846
1999	33079
2000	31650
2001	30343
2002	28918
2003	27263
2004	25879
2005	24928
2006	24113
2007	23516
2008	22972
2009	22370
2010	21763
2011	21386
2012	21373
2013	21486
2014	21430
2015	20980
2016	20193
2017	19399
2018	18118
2019	15959
2020	14119
2021	13074
2022	12271