Year	%
1987	21.2270163288027
1988	43.22756102276112
1989	41.514823121940005
1990	63.180434566457414
1991	57.15914377106615
1992	58.9678929574966
1993	62.41998639056017
1994	62.75226226969371
1995	65.76095498553785
1996	62.87759611557124
1997	64.61320272816576
1998	64.66579992094812
1999	67.15017126652674
2000	70.49593020950151
2001	72.91593635946559
2002	74.70733375082466
2003	74.98565257409163
2004	76.99570832251473
2005	74.74118198808192
2006	75.43089439776739
2007	75.3976638986358
2008	76.57698529268359
2009	78.19730752778263
2010	81.80415675587332
2011	82.38347754324153
2012	82.42966308252454
2013	81.14880283200985
2014	81.09618379661036
2015	81.58984364847831
2016	80.21830207602419
2017	82.93470824283807
2018	82.83042859281753
2019	82.89356275950603
2020	82.25192630111034
2021	82.96080803391668
2022	82.71722983364732