Year	Number
1970	90069.5
1971	90713.72
1972	94674.71
1973	95593.26
1974	97537.48
1975	100387.9
1976	100785.6
1977	101653.4
1978	104344
1979	106038.4
1980	106335.2
1981	110204.7
1982	112653.3
1983	118003.8
1984	120684.6
1985	126146.8
1986	129465
1987	126194.3
1988	125297.1
1989	119186.6
1990	122030.4
1991	117544.6
1992	114914.8
1993	110575.9
1994	109697.2
1995	111045.7
1996	99321.63
1997	100440.7
1998	102255.2
1999	103415.2
2000	106298.8
2001	111381.1
2002	117346.7
2003	121102.4
2004	134339.4
2005	140675.9
2006	137479
2007	133582.2
2008	130319.3
2009	130441.2
2010	129065.8
2011	127316.6
2012	129892.8
2013	132194.7
2014	134118.8
2015	135335.7
2016	143127
2017	144504.8
2018	146518.4