Year	Number
1960	79000
1961	81200
1962	83400
1963	85700
1964	88100
1965	90500
1966	93500
1967	96500
1968	99500
1969	104000
1970	112000
1971	120000
1972	125500
1973	128500
1974	131000
1975	132500
1976	134000
1977	136000
1978	137500
1979	138500
1980	140050
1981	142650
1982	145700
1983	148700
1984	151650
1985	154450
1986	157350
1987	160500
1988	163650
1989	166898
1990	170899
1991	175362
1992	179799
1993	184496
1994	189482
1995	193816
1996	197564
1997	201418
1998	205279
1999	209214
2000	213230
2001	217324
2002	221490
2003	225296
2004	228750
2005	232250
2006	235750
2007	239250
2008	242750
2009	245950
2010	249750
2011	254350
2012	259000
2013	263650
2014	268050
2015	269460
2016	270220
2017	270810
2018	271170
2019	271240
2020	271080
2021	270390
2022	269215
2023	267940