Year	Percent
1950	13.0503
1955	12.91528
1960	13.47284
1965	13.78962
1970	13.81041
1975	13.81884
1980	14.0675
1985	14.32141
1990	14.84044
1995	13.74575
2000	14.01169
2005	14.4215
2010	14.69321
2015	14.56433
2020	14.2064
2025	13.715
2030	13.37187
2035	13.01286
2040	12.57404
2045	12.04123
2050	11.48783
2055	10.94101
2060	10.42847
2065	9.94653
2070	9.47977
2075	9.04411
2080	8.62699
2085	8.24384
2090	7.88622
2095	7.55309
2100	7.26168