Year	%
1990	75
1991	71.0144927536232
1992	67.175572519084
1993	62.2950819672131
1994	58.0046403712297
1995	53.59565807327
1996	49.748743718593
1997	46.481178396072
1998	44.0440060698027
1999	42.4268018018018
2000	41.4677276746242
2001	40.9250046065966
2002	40.6190172303765
2003	40.4481633810807
2004	40.3477141017386
2005	40.2563493947306
2006	40.4325755903774
2007	40.8036454018227
2008	41.3475663500147
2009	42.0222201475119
2010	42.7994616419919
2011	43.4068797776234
2012	43.8964554606209
2013	44.4924047480701
2014	45.0443058746308
2015	45.5464102355146
2016	46.0836253973429
2017	46.6835899115624
2018	47.2989589310599
2019	47.952736522524
2020	48.5958285432748
2021	49.1128634795466
2022	49.6275071633238