Year	Number
1971	1937920
1984	1000983
1985	1048550
1986	1046111
1987	1078136
1988	1069751
1989	1086307
1990	621033
1992	329265
1997	617274
1999	1248058
2000	1258098
2002	498568
2003	511741
2004	277546
2005	273047
2006	70416
2007	56963
2009	22508
2010	16925
2011	9176
2012	19227
2013	90884
2014	30869
2015	41355