Year	Number
1972	213302
1999	190640
2000	181187
2002	114339
2003	151849
2004	213526
2005	193352
2006	211568
2007	136643
2008	179779
2009	61560
2010	96251
2011	108626
2012	133202
2013	149188
2014	178906
2015	142120
2016	154709