Year	Percent
1950	13.81052
1955	14.43207
1960	14.83982
1965	14.96754
1970	14.93613
1975	14.79249
1980	14.5769
1985	14.37541
1990	13.87203
1995	13.42513
2000	13.72731
2005	14.4722
2010	15.31001
2015	16.18387
2020	17.05273
2025	18.21152
2030	19.9014
2035	21.45638
2040	22.5213
2045	22.85782
2050	23.25254
2055	24.08382
2060	24.9699
2065	25.86568
2070	26.1408
2075	26.00498
2080	25.98248
2085	26.16827
2090	26.42091
2095	26.50585
2100	26.33197