Year	Number
1960	55695
1961	57362
1962	58981
1963	60577
1964	62178
1965	63791
1966	65424
1967	67086
1968	68756
1969	70407
1970	72206
1971	74306
1972	76694
1973	79332
1974	82178
1975	85345
1976	88837
1977	92906
1978	98452
1979	105518
1980	110785
1981	113866
1982	116966
1983	120069
1984	123092
1985	125846
1986	128334
1987	130746
1988	133537
1989	136756
1990	140181
1991	143615
1992	147207
1993	150897
1994	154212
1995	156935
1996	158769
1997	159629
1998	159685
1999	158969
2000	157587
2001	155624
2002	153598
2003	152135
2004	151449
2005	151528
2006	152019
2007	152868
2008	154334
2009	156551
2010	159510
2011	163057
2012	166822
2013	170287
2014	175463
2015	182776
2016	190138
2017	197217
2018	203880
2019	209922
2020	214331
2021	215456
2022	214515
2023	215336