Year	per 1,000
1990	1.4701637302214792
1991	1.4411065653390465
1992	1.4073993052947897
1993	1.3780508865008045
1994	1.335503044622437
1995	1.3186292829130746
1996	1.288052075262588
1997	1.2323460994896887
1998	1.2207294029601843
1999	1.2889709061976742
2000	1.1466080777190393
2001	1.1389105594813058
2002	1.1117488266941709
2003	1.0626718872518484
2004	1.0463753326628467
2005	1.0339935369316193
2006	0.9932070887167406
2007	0.9740697111846748
2008	0.9495053938453184
2009	0.9337387995942139
2010	0.879163021438863
2011	0.8954261918532191
2012	0.8267407242748719
2013	0.8107204355079376
2014	0.7954907658645222
2015	0.7796919380750493
2016	0.7445496655294046
2017	0.7415740973465568
2018	0.7622978270069459
2019	0.7488103802848679
2020	0.7462600205047993
2021	0.7443636799300548
2022	0.7664430182347279