Year	Number
1960	124488
1961	129577
1962	134654
1963	139872
1964	145848
1965	152699
1966	159856
1967	166914
1968	173620
1969	179769
1970	185191
1971	189618
1972	189572
1973	185558
1974	181385
1975	177027
1976	172427
1977	167562
1978	162480
1979	157217
1980	152985
1981	150284
1982	148288
1983	146923
1984	146311
1985	146479
1986	147135
1987	147754
1988	148862
1989	150535
1990	151756
1991	152779
1992	154130
1993	155404
1994	157326
1995	159169
1996	159739
1997	159736
1998	159242
1999	158385
2000	157360
2001	156365
2002	155566
2003	154988
2004	155474
2005	156907
2006	158330
2007	159763
2008	161119
2009	162286
2010	163203
2011	163879
2012	164282
2013	164356
2014	164172
2015	163891
2016	163607
2017	163315
2018	163027
2019	162747
2020	162500
2021	162329
2022	162206
2023	162118