Year	%
1990	28.9986091794159
1991	29.2
1992	29.4317629917436
1993	29.6610169491525
1994	29.8377970577141
1995	30.058000682361
1996	30.3339517625232
1997	30.6850084222347
1998	31.0574948665298
1999	31.4076868663051
2000	31.8023508924684
2001	32.2574137583216
2002	32.713963963964
2003	33.1348511383538
2004	33.5244022273174
2005	33.7738168408113
2006	33.9535554593971
2007	34.0785907859079
2008	34.1594276954522
2009	34.2047930283224
2010	34.2126390641129
2011	34.1587922233084
2012	34.1097308488613
2013	34.0691830097566
2014	33.9874778058125
2015	33.9346010307446
2016	33.9497794367153
2017	33.9723801787165
2018	34.0624270257648
2019	34.2046303211352
2020	34.3886854763443
2021	34.5435684647303
2022	34.6555740432612