Year	Percent
1950	14.17786
1955	14.45581
1960	13.81421
1965	13.80211
1970	14.29383
1975	14.51496
1980	15.00845
1985	15.06222
1990	15.21666
1995	15.4001
2000	15.28036
2005	15.86259
2010	15.17167
2015	13.85729
2020	13.1916
2025	12.50145
2030	11.8039
2035	11.0358
2040	10.30787
2045	9.61237
2050	9.01205
2055	8.46398
2060	7.95964
2065	7.49824
2070	7.09247
2075	6.73354
2080	6.43503
2085	6.17576
2090	5.96014
2095	5.76448
2100	5.59931