Year	per 100 people
1980	0.184248932
1981	0.253654462
1982	0.393110333
1983	0.487223747
1984	0.545743536
1985	0.61145693
1986	0.6491855
1987	0.681226728
1988	0.70475759
1989	0.720924412
1990	0.930952326
1991	0.942317243
1992	0.993378653
1993	1.074936653
1994	1.111882587
1995	1.159132277
1996	1.232081277
1997	1.287504279
1998	1.417043964
1999	1.569434342
2000	1.861155099
2001	2.205599542
2002	2.757812775
2003	3.436975127
2004	3.848861108
2005	4.227751556
2006	4.408243938
2007	4.513827638
2008	4.119335742
2009	4.149051405
2010	4.228359535
2011	4.219722315
2012	4.209981844
2013	4.235843149
2014	4.210669836
2015	4.005488743
2016	3.982468813
2017	3.962124883
2019	3.930681668
2020	3.840906434
2021	3.759667386