Year	per 1,000 people
1990	5.422
1991	6.029
1992	6.025
1993	5.894
1994	5.97
1995	6.381
1996	6.556
1997	6.691
1998	6.726
1999	6.863
2000	6.87
2001	7.16
2002	7.199
2003	7.392
2004	7.423
2005	7.49
2006	7.609
2007	7.74
2008	7.871
2009	8.047
2010	8.201
2011	8.334
2012	8.172
2013	8.327
2014	8.574
2015	8.783
2016	9.624
2017	9.87
2018	10.1
2019	10.29
2020	10.54