Year	Number
1991	2296087
1992	2272063
1993	2299144
1994	2286317
1995	2260978
1996	2274624
1997	2320465
1998	1690193
1999	1729976
2000	1735846
2001	1740473
2002	1753409
2003	1729839
2004	1791293
2005	1790168
2006	1812986
2007	1726660
2008	1741243
2009	1582678
2010	1557160
2011	1457886
2012	1396380
2013	1338507.37383
2014	1348527.19398
2015	1320985.95497
2016	1351989.48324
2017	1347863.12896