Year	Percent
1950	16.68508
1955	19.10046
1960	18.65259
1965	18.19386
1970	17.2619
1975	16.64988
1980	13.34042
1985	19.43109
1990	19.23347
1995	16.57085
2000	12.95763
2005	11.53999
2010	11.68294
2015	11.37158
2020	10.65888
2025	9.62447
2030	8.81463
2035	8.33034
2040	7.97478
2045	7.55567
2050	7.0655
2055	6.61972
2060	6.28289
2065	6.03898
2070	5.84711
2075	5.65281
2080	5.46396
2085	5.29946
2090	5.16872
2095	5.06662
2100	4.98668