Year	Percent
1950	13.02305
1955	12.84504
1960	14.0632
1965	13.87902
1970	13.78765
1975	13.78131
1980	13.80087
1985	13.95281
1990	13.73182
1995	13.16895
2000	12.68537
2005	12.27566
2010	11.58573
2015	10.81725
2020	10.06298
2025	9.661
2030	9.22484
2035	8.76475
2040	8.29033
2045	7.84501
2050	7.43817
2055	7.08123
2060	6.75819
2065	6.46913
2070	6.20378
2075	5.96925
2080	5.76192
2085	5.58851
2090	5.43802
2095	5.30547
2100	5.19132