Year	Percent
1950	6.35455
1955	6.23542
1960	6.12199
1965	5.85657
1970	5.85507
1975	5.73519
1980	5.6783
1985	5.55918
1990	6.19645
1995	6.62919
2000	7.15154
2005	7.76431
2010	8.3611
2015	9.4362
2020	10.49273
2025	11.58233
2030	12.6837
2035	13.7617
2040	14.86219
2045	16.3735
2050	18.11565
2055	19.7258
2060	21.19294
2065	22.56647
2070	24.00501
2075	25.61947
2080	27.11517
2085	28.4332
2090	29.57823
2095	30.59479
2100	31.52565