Year	Percent
1950	13.79399
1955	12.88003
1960	13.61249
1965	13.97839
1970	14.47354
1975	14.44342
1980	14.71285
1985	15.13712
1990	14.8572
1995	14.39251
2000	14.28836
2005	14.77659
2010	14.48366
2015	14.01518
2020	13.93697
2025	13.77068
2030	13.42293
2035	12.99123
2040	12.59181
2045	12.20481
2050	11.82344
2055	11.43747
2060	11.04489
2065	10.68978
2070	10.34053
2075	10.00707
2080	9.66953
2085	9.35776
2090	9.04391
2095	8.75695
2100	8.45137