Year	Percent
1950	11.15899
1955	12.26413
1960	11.48212
1965	8.53498
1970	7.45735
1975	7.8503
1980	8.5702
1985	8.71551
1990	7.37795
1995	6.32437
2000	5.04832
2005	4.39485
2010	4.93622
2015	4.68001
2020	4.25541
2025	3.87965
2030	3.64675
2035	3.53724
2040	3.62149
2045	3.7489
2050	3.76132
2055	3.67048
2060	3.59631
2065	3.60258
2070	3.71381
2075	3.87977
2080	4.01013
2085	4.06246
2090	4.05545
2095	4.05812
2100	4.10271