Year	per 1,000
1990	25.545621683444544
1991	25.032347777613396
1992	24.545663944511876
1993	24.059046431489453
1994	23.59861646602185
1995	23.089080961136645
1996	22.576654489429593
1997	22.136143934493646
1998	21.60522890855809
1999	21.09264718942658
2000	20.545962596739123
2001	20.027992072789907
2002	19.495423476705078
2003	18.9920960950597
2004	18.43629457012213
2005	17.921285164492655
2006	17.407376928011104
2007	16.944391762154996
2008	16.508821349832854
2009	16.069354311376593
2010	15.641397201776554
2011	15.238782725981354
2012	14.823735046223161
2013	14.476923691267084
2014	14.106238027075847
2015	13.775500890821748
2016	13.462128169256626
2017	13.132577670621583
2018	12.81136040634696
2019	12.522551132446422
2020	12.188119052945623
2021	11.837512797594615
2022	11.541722015538127