Year	Percent
1950	13.20188
1955	13.09607
1960	13.68814
1965	14.01897
1970	14.04449
1975	14.04782
1980	14.32994
1985	14.63382
1990	15.52574
1995	14.34667
2000	14.58837
2005	14.90734
2010	15.15176
2015	14.982
2020	14.5777
2025	14.0377
2030	13.65798
2035	13.26985
2040	12.80865
2045	12.26056
2050	11.69737
2055	11.14336
2060	10.62469
2065	10.13855
2070	9.67052
2075	9.23421
2080	8.81649
2085	8.43257
2090	8.07147
2095	7.73323
2100	7.43755