Year	%
1981	10.208431783126551
1982	11.147776339581254
1983	12.121942691622223
1984	11.318336222694379
1985	13.434566064461213
1986	18.44508506709652
1987	22.70265490446759
1988	28.943204761064067
1989	32.68248462604215
1990	37.1871749350262
1991	40.28035298105852
1992	40.98484450301942
1993	43.05613345769364
1994	42.66520344898199
1995	49.18519121375609
1996	48.971290904945405
1997	52.59386254368484
1998	52.59412177359085
1999	54.90728214719745
2000	59.46523903975521
2001	60.766320560444704
2002	63.59230497062256
2003	65.86320027215788
2004	68.03832303040657
2005	69.67350594025176
2006	71.73150818147381
2007	72.92061679584708
2008	75.43213721799063
2009	77.553684825968
2010	77.1522667231883
2011	72.17858662968526
2012	72.0273671675747
2013	71.87197472246656
2014	70.02041440132352
2015	70.77235737618881
2016	70.82521170684288
2017	71.14444404660368
2018	73.44099342850122
2019	73.25396784938224
2020	76.16751622908843
2021	76.10624658906968
2022	76.47382370838406