Year	Number
1971	43867
1972	68127
1973	91781
1974	113326
1975	171244
1976	194467
1977	247497
1985	184972
1988	220509
1990	240264
1991	262745
1992	307069
1993	327937
1994	375205
1995	368218
1999	586235
2000	673343
2001	698697
2002	736199
2003	819264
2004	871717
2005	875814
2006	894355
2007	865449
2008	838451
2009	823405
2010	790695
2011	801137
2012	813189
2013	908577
2014	894844
2015	832083
2016	811444
2017	763440