Year	Number
1995	16652119.272753762
1996	16883667.810397737
1997	18570111.722413797
1998	19110481.739070974
1999	20547389.638149675
2000	22028654.63923025
2001	22699583.121966902
2002	23251643.310645618
2003	23525106.48666884
2004	25484888.26690859
2005	25761318.527669124
2006	27999916.146485254
2007	30898966.037649684
2008	32780642.470848747
2009	32486504.558505412
2010	37843566.163916536
2011	33747412.9930026
2012	36199883.00667659
2013	39516963.59896522
2014	42941757.49010313
2015	43653648.12222777
2016	46851127.10151834
2017	49979552.76387189
2018	51524462.8351512
2019	51930012.46659737