Year	per 1,000
1990	11.676761648380667
1991	11.495134646497805
1992	11.329791192178421
1993	11.569694291169927
1994	14.101385080650102
1995	10.680046995401227
1996	10.490238854533017
1997	10.252574503043311
1998	10.187694303529765
1999	9.698864022273767
2000	9.411703834932661
2001	9.1557702537174
2002	8.871852893203775
2003	8.614766481014772
2004	8.37182604312029
2005	8.123400257414197
2006	7.907565526338755
2007	7.687249922001798
2008	7.494771374913674
2009	7.2822626125307135
2010	7.60690515233679
2011	6.915122702413328
2012	6.6988580467626555
2013	6.554176469982036
2014	6.397294773041516
2015	6.259084074497421
2016	6.137493462325716
2017	6.024422179016446
2018	5.936183963442456
2019	5.869269312648647
2020	5.785505683689059
2021	5.700778814741794
2022	5.5889013815813495