Year	Number
1970	238437
1971	237349
1972	239682
1974	246754
1975	247014
1978	255636
1981	243826
1982	275243
1983	256805
1997	231120
1999	151801
2000	133852
2001	146720
2002	121617
2004	81718
2005	69224
2006	54612
2007	46112
2008	49304
2009	21560
2010	33593
2011	62042
2012	96779
2013	124370
2014	146293
2015	148648
2016	154730