Year	Number
1972	4238218.5
1973	4417774
1974	4562628.5
1975	4640724
1976	4766079.5
1977	4960400.5
1978	5082023.5
1979	5110933
1980	5123158
1981	5180996
1982	5225479
1983	5358112
1984	5499427.5
1985	5720237
1986	5968253.5
1987	6227745.5
1988	6445563.5
1989	6613110
1990	6866002
1991	7077510.5
1992	7237791.5
1993	7412221.5
1994	7595150.5
1995	7801708
1996	8128095.5
1997	8405722
1998	8751139
1999	9073079
2000	9349664
2001	9408018
2002	9997552
2003	10456864
2004	10667141
2005	11069757
2006	11077195
2007	11607323
2008	12122278
2009	12478918
2010	12827952
2011	13165694
2012	13245957
2013	13361546
2014	13626080
2015	13933220
2016	14390935
2017	14796765
2018	15448047
2019	16168278
2020	16414487
2021	17240306
2022	17620066