Year	Percent
1950	14.25978
1955	13.87918
1960	13.55296
1965	12.29416
1970	12.08642
1975	10.77047
1980	9.87476
1985	9.36826
1990	8.52573
1995	7.72112
2000	7.54666
2005	6.93059
2010	6.28855
2015	5.81087
2020	5.09758
2025	4.83828
2030	4.64516
2035	4.50822
2040	4.33373
2045	4.14049
2050	3.97975
2055	3.88286
2060	3.85887
2065	3.86403
2070	3.86171
2075	3.84409
2080	3.8306
2085	3.83854
2090	3.89069
2095	3.96196
2100	4.02056