Year	Percent
1950	13.08204
1955	13.37447
1960	13.53197
1965	13.61792
1970	13.7234
1975	13.94077
1980	14.12247
1985	14.27881
1990	14.11324
1995	13.33175
2000	12.94009
2005	12.82067
2010	12.91619
2015	13.31727
2020	13.6504
2025	14.01296
2030	14.73653
2035	15.73649
2040	16.90214
2045	18.02073
2050	19.00437
2055	19.87901
2060	20.72223
2065	21.59123
2070	22.35826
2075	23.00318
2080	23.49556
2085	23.88881
2090	24.2365
2095	24.55256
2100	24.81248