Year	per 1,000 people
1995	2.496
1997	2.689
1998	2.868
1999	3.105
2000	3.283
2001	3.156
2002	3.093
2003	2.909
2004	2.887
2005	3.333
2006	3.229
2007	3.581
2009	4.208
2015	4.365