Year	Percent
1950	13.06434
1955	13.3392
1960	13.40715
1965	13.3397
1970	13.15893
1975	12.9768
1980	12.87489
1985	12.88186
1990	13.09871
1995	13.04826
2000	13.32343
2005	13.70018
2010	14.35343
2015	15.42015
2020	16.54295
2025	17.75424
2030	18.56781
2035	19.15207
2040	19.59814
2045	19.89862
2050	20.58021
2055	21.58976
2060	22.41268
2065	23.07964
2070	23.44717
2075	23.57972
2080	23.81636
2085	24.17289
2090	24.5378
2095	24.78637
2100	24.90653