Year	Percent
1950	16.95913
1955	20.69185
1960	20.88675
1965	19.26062
1970	18.8001
1975	19.11205
1980	18.92869
1985	18.50158
1990	17.16767
1995	15.33691
2000	13.66364
2005	12.24375
2010	11.38708
2015	10.32218
2020	9.3637
2025	8.45403
2030	7.69647
2035	7.07158
2040	6.57683
2045	6.15592
2050	5.78487
2055	5.46501
2060	5.18391
2065	4.96892
2070	4.80297
2075	4.67711
2080	4.59073
2085	4.52114
2090	4.46923
2095	4.43243
2100	4.41278