Year	per 1,000 uninfected population
1990	5.2
1991	8.21
1992	12.09
1993	16.31
1994	20.09
1995	22.6
1996	22.27
1997	21.5
1998	19.89
1999	18.48
2000	17.66
2001	16.97
2002	16.53
2003	16.23
2004	16.2
2005	16.03
2006	15.77
2007	14.7
2008	14.18
2009	13.1
2010	11.89
2011	11.1
2012	10.82
2013	10.78
2014	9.92
2015	8.85
2016	7.52
2017	6.52
2018	5.42
2019	4.99
2020	4.35
2021	3.75
2022	3.03