Year	Percent
1970	62.61088
1977	74.13177
1978	73.34933
1979	73.69496
1980	74.57405
1981	73.29706
1993	85.27472
1995	88.55214
1998	95.88398
1999	101.20871
2000	99.67833
2001	95.47569
2002	95.893
2003	101.7151
2004	102.03718
2005	102.74421
2006	104.0091
2007	106.58406
2008	105.97994
2009	103.1934
2010	104.82867
2011	100.7976
2012	94.41569
2013	95.81217
2014	96.65423
2015	99.91045
2016	103.06094