Year	per 1,000 people
1990	6.3729
1992	6.7448
1994	7.2509
1996	7.7699
1998	8.2161
2000	8.6546
2002	8.612
2004	8.971
2006	9.32
2008	9.774
2010	10.31
2012	10.74
2014	11.18
2016	11.59
2018	12.04
2020	12.45