Year	per 1,000
1990	7.694470294875476
1991	7.32553741969826
1992	7.0598591650378735
1993	6.919389997601367
1994	6.8332937002813345
1995	6.7385464891167715
1996	6.61418450105306
1997	6.5142059484345065
1998	6.362396348644943
1999	6.212672358395593
2000	6.075724617637095
2001	5.967572218483344
2002	5.867493877215825
2003	5.753604130733108
2004	5.644741752357313
2005	5.556118343225858
2006	5.474005687321084
2007	5.3320256641192785
2008	5.44723110156037
2009	5.244715697848956
2010	5.245182408632084
2011	5.388610410204348
2012	5.954153897409747
2013	6.015775341753482
2014	5.884397080006521
2015	6.0718072428539775
2016	5.83776222680233
2017	5.869828111613144
2018	5.92329419743594
2019	5.503286683039779
2020	5.229993288701025
2021	5.163554359385128
2022	5.060793036509451