Year	Percent
1950	14.21893
1955	14.79678
1960	17.82818
1965	18.15746
1970	18.52727
1975	15.81047
1980	14.09562
1985	13.06618
1990	12.76839
1995	11.95493
2000	10.09564
2005	7.66153
2010	6.41558
2015	6.08444
2020	5.78302
2025	5.42261
2030	5.062
2035	4.68471
2040	4.35179
2045	4.16162
2050	4.08824
2055	4.05894
2060	4.01291
2065	3.94909
2070	3.89359
2075	3.88188
2080	3.92677
2085	4.00151
2090	4.07617
2095	4.12306
2100	4.14737