Year	Percent
1950	13.84593
1955	14.05016
1960	13.68301
1965	13.41546
1970	13.58579
1975	14.02856
1980	14.58551
1985	15.19185
1990	16.26117
1995	17.32759
2000	19.30488
2005	21.75644
2010	23.32059
2015	24.15401
2020	24.75356
2025	25.42798
2030	26.4573
2035	27.70765
2040	28.10549
2045	27.3194
2050	26.29452
2055	25.25654
2060	24.4312
2065	24.032
2070	23.50306
2075	23.02694
2080	22.60357
2085	22.33781
2090	22.1821
2095	22.08235
2100	21.98082