Year	Percent
1950	4.04167
1955	3.85082
1960	3.74226
1965	3.73504
1970	3.83787
1975	4.04933
1980	4.35847
1985	4.79309
1990	5.9492
1995	6.77149
2000	7.55804
2005	8.13844
2010	8.93492
2015	10.09966
2020	11.62765
2025	13.36466
2030	15.15259
2035	16.96517
2040	18.79501
2045	20.796
2050	22.80471
2055	24.83083
2060	26.64904
2065	28.56179
2070	30.45085
2075	32.25486
2080	33.86539
2085	35.27457
2090	36.49865
2095	37.53978
2100	38.40549