Year	Number
1960	13555
1961	13633
1962	13654
1963	13651
1964	13681
1965	13769
1966	13925
1967	14152
1968	14411
1969	14637
1970	14809
1971	14924
1972	14994
1973	15052
1974	15119
1975	15202
1976	15305
1977	15425
1978	15583
1979	15812
1980	16134
1981	16531
1982	17000
1983	17549
1984	18214
1985	19001
1986	19915
1987	20965
1988	22092
1989	23218
1990	24302
1991	25328
1992	26259
1993	27119
1994	27971
1995	28841
1996	29725
1997	30620
1998	31497
1999	32319
2000	33062
2001	33747
2002	34394
2003	35005
2004	35571
2005	36093
2006	36594
2007	37113
2008	37681
2009	38306
2010	38998
2011	39731
2012	40451
2013	41201
2014	42259
2015	43673
2016	45301
2017	47171
2018	49204
2019	51374
2020	53645
2021	55421
2022	57438
2023	60233