Year	Number
1973	718525
1974	737915
1977	757226
1978	770004
1981	803809
1986	873340
1989	980282
1990	1015936
1991	1040403
1992	1099067
1997	1222149
1998	1255869
1999	1274000
2000	1311189
2001	1291740
2002	1269196
2003	1248581
2004	1233282
2005	1291671
2006	1319307
2007	1347609
2008	1324820
2009	1288503
2010	1236386
2011	1153161
2012	1158516
2013	1217862
2014	1270717
2015	1270362
2016	1282980