Year	Percent
1950	12.91361
1955	12.63319
1960	14.50433
1965	14.48274
1970	14.35259
1975	14.29617
1980	13.86503
1985	13.1277
1990	12.53405
1995	12.11636
2000	11.44888
2005	10.79831
2010	9.91485
2015	9.49724
2020	9.03824
2025	8.51971
2030	7.98546
2035	7.49089
2040	7.05877
2045	6.67983
2050	6.34116
2055	6.03805
2060	5.76556
2065	5.53215
2070	5.33334
2075	5.16555
2080	5.02937
2085	4.91238
2090	4.81293
2095	4.72816
2100	4.65782