Year	per 1,000 people
1990	4.049
1991	4.165
1992	4.346
1993	4.595
1994	4.922
1995	5.129
1996	5.248
1997	5.374
1998	5.46
1999	5.61
2000	5.736
2001	5.783
2002	5.883
2003	5.889
2004	6.13
2005	6.199
2006	6.355
2007	6.427
2008	6.579
2009	6.697
2010	6.759
2011	6.857
2012	6.888
2013	6.936
2014	7.037
2015	7.043
2016	7.027
2017	7.108
2018	7.13
2019	10.65
2020	10.77