Year	Number
1960	72374
1961	73873
1962	75412
1963	76996
1964	78621
1965	80255
1966	81879
1967	83480
1968	85046
1969	86534
1970	88300
1971	90505
1972	92815
1973	95100
1974	97329
1975	99478
1976	101590
1977	103676
1978	105710
1979	107790
1980	110286
1981	113221
1982	116189
1983	119067
1984	121885
1985	124675
1986	127462
1987	130259
1988	133079
1989	135759
1990	138263
1991	140739
1992	143173
1993	145541
1994	147843
1995	150094
1996	152261
1997	154330
1998	156357
1999	158395
2000	160188
2001	161524
2002	162563
2003	163385
2004	164004
2005	164430
2006	164675
2007	164763
2008	164725
2009	164580
2010	164905
2011	165649
2012	166392
2013	167054
2014	167543
2015	167978
2016	168346
2017	168606
2018	168678
2019	168624
2020	169231
2021	170534
2022	171774
2023	172952