Year	Number
1970	1742882
1971	1763861
1972	1834979
1973	1846231.125
1974	1944454.75
1975	2023987
1976	2112691.75
1977	2190357.5
1978	2221969
1979	2270698.5
1980	2305680.75
1981	2324916.25
1982	2335749.5
1983	2334136.25
1984	2326262.5
1985	2333377.25
1986	2338095.25
1987	2341044.75
1988	2341160.25
1989	2337763.25
1990	2372371.25
1991	2413842.25
1992	2446766.75
1993	2512033.75
1994	2550802.25
1995	2473346.25
1996	2424946.25
1997	2407577
1998	2371403.25
1999	2379352
2000	2449210
2001	2498668.5
2002	2515294.5
2003	2506205.5
2004	2496444.75
2005	2535351.5
2006	2506781.25
2007	2522040.5
2008	2510018
2009	2483964.75
2010	2485025.25
2011	2466358.5
2012	2432251.5
2013	2400960.25
2014	2390306.5
2015	2391961
2016	2448378
2017	2458984.75
2018	2477332.75
2019	2488041.5
2020	2512140
2021	2549321.5
2022	2561729.25