Year	Percent
1950	13.37502
1955	13.87516
1960	13.64451
1965	13.93827
1970	14.19967
1975	13.82677
1980	13.32361
1985	12.43976
1990	13.00917
1995	12.93576
2000	12.29449
2005	10.10226
2010	8.80886
2015	7.83911
2020	7.1442
2025	7.25158
2030	6.64334
2035	5.89692
2040	5.40541
2045	5.18705
2050	5.1875
2055	5.22886
2060	5.14839
2065	4.95017
2070	4.73785
2075	4.62166
2080	4.62074
2085	4.66763
2090	4.68163
2095	4.63662
2100	4.56386