Year	per 1,000 people
1990	10.31
1991	10.67
1992	11.22
1993	11.83
1994	13.17
1995	13.85
1996	14.55
1997	15.23
1998	15.9
1999	16.48
2000	16.96
2001	17.32
2002	17.68
2003	17.91
2004	10.84
2005	11.19
2006	11.57
2007	11.79
2008	12.2
2009	12.4
2010	12.37
2011	12.59
2012	12.87
2013	13.03
2014	13.26
2015	13.35
2016	13.38
2017	13.69
2018	13.99
2019	21.99
2020	22.32