Year	per 100 people
1983	2.663631831
1984	2.625339758
1985	2.587256921
1986	2.549324587
1987	2.512071382
1988	2.475558318
1989	2.439623586
1990	2.403901282
1991	2.36792496
1992	2.332090531
1993	2.296420381
1994	2.261908666
1995	2.233585115
1996	2.210985796
1997	2.190352784
1998	2.17168131
1999	2.154754651
2000	2.139764358
2001	3.657625498
2002	3.875048962
2003	4.120814372
2004	4.175551893
2005	4.149208526
2006	4.126134104
2007	4.844701453
2008	4.822419116
2009	4.800356235
2010	4.779953039
2011	4.761176751
2012	4.741284575
2013	4.719656598
2014	4.696306009
2015	4.671784382
2016	4.647570221
2017	4.624491125
2019	4.581556185
2020	4.561714527
2021	4.543370301