Year	Percent
1950	12.10046
1955	11.95854
1960	11.90383
1965	11.89493
1970	11.72153
1975	11.46641
1980	11.38204
1985	11.79584
1990	12.14057
1995	12.78759
2000	13.44312
2005	14.81146
2010	16.05553
2015	16.79531
2020	17.66235
2025	18.40695
2030	19.95233
2035	20.74943
2040	21.53391
2045	21.70445
2050	21.99936
2055	22.49668
2060	22.90484
2065	23.39055
2070	23.40535
2075	23.58679
2080	23.73922
2085	23.8913
2090	24.00483
2095	24.03353
2100	24.00261