Year	Percent
1950	3.42916
1955	3.36945
1960	3.47664
1965	3.61833
1970	3.82252
1975	4.12558
1980	4.42525
1985	4.67563
1990	5.26668
1995	5.5601
2000	6.07756
2005	6.76142
2010	7.5735
2015	8.58899
2020	9.98687
2025	11.84161
2030	13.52188
2035	14.86006
2040	16.34713
2045	17.95505
2050	19.79483
2055	21.48432
2060	23.05746
2065	24.64525
2070	26.25155
2075	27.80745
2080	29.22395
2085	30.47178
2090	31.57583
2095	32.52617
2100	33.34131