Year	Number
1971	1863099
1977	1287184
1985	771865
1986	530285
1987	415237
1988	419312
1989	659156
1990	395128
1991	430271
1992	379136
1993	395966
1994	452927
1995	477012
1996	515982
1997	576369
1998	552557
1999	149546
2000	89346
2001	83474
2002	78024
2003	69128
2004	155334
2005	331003
2006	470197
2007	512179
2008	519895
2009	429335
2010	304461
2011	191070
2012	146866
2013	163559
2014	170500
2015	156901
2016	139577