Year	Percent
1950	17.91039
1955	19.87895
1960	18.27912
1965	17.90994
1970	16.69931
1975	13.10332
1980	11.66173
1985	11.52618
1990	11.41072
1995	10.6399
2000	9.9459
2005	9.72107
2010	8.94806
2015	8.36991
2020	7.5728
2025	7.17
2030	6.93322
2035	6.68904
2040	6.38461
2045	6.06371
2050	5.80411
2055	5.61854
2060	5.49471
2065	5.37575
2070	5.23732
2075	5.07945
2080	4.93204
2085	4.82282
2090	4.75441
2095	4.71192
2100	4.68107