Year	Number
1972	106353
1973	108717
1974	111551
1975	114728
1976	118453
1977	122619
1978	127332
1979	132820
1980	138376
1981	142271
1982	144576
1983	146637
1984	148470
1985	149399
1986	149955
1987	150339
1988	149565
1989	148068
1990	147213
1991	146235
1992	145163
1993	143794
1994	142786
1995	142683
1996	141852
1997	139525
1998	136263
1999	132119
2000	127760
2001	123407
2002	119318
2003	115781
2004	112407
2005	108954
2006	105752
2007	101195
2008	98397
2009	96158
2010	96545
2011	94847
2012	92772
2013	90267
2014	87505
2015	83949
2016	82035
2017	81174
2018	80481
2019	79055
2020	78459
2021	77685
2022	76879