Year	Number
1979	6282.33251953125
1980	6424.36572265625
1981	6473.0029296875
1982	6575.74365234375
1983	6576.68701171875
1984	6655.9482421875
1985	6617.43896484375
1986	6693.18212890625
1987	6783.228515625
1988	6802.26904296875
1989	6901.9189453125
1990	7005.20556640625
1997	9743.9462890625
1998	9827.8359375
1999	10358.919921875
2000	10592.4384765625
2001	11332.826171875
2002	11806.248046875
2003	10652.814453125
2004	11050.634765625
2005	10836.830078125
2006	10706.38671875
2007	10957.103515625
2008	12078.1484375
2009	11632.126953125
2010	11328.7666015625
2011	11257.8876953125
2012	12475.69921875
2013	12579.794921875
2014	12617.548828125
2015	13096.4521484375
2016	12582.333984375