Year	per 1,000 people
2003	1.101
2005	1.154
2006	1.155
2007	1.179
2008	1.287
2009	1.297
2010	1.258
2011	1.357
2012	1.359
2013	1.347
2014	1.341
2015	1.35
2016	1.447
2017	1.53