Year	Percent
1950	3.64716
1955	3.30915
1960	2.67052
1965	2.28301
1970	2.62407
1975	2.61882
1980	2.15466
1985	2.16819
1990	2.32341
1995	2.55238
2000	2.9354
2005	3.58959
2010	3.45654
2015	4.46399
2020	6.80045
2025	9.03364
2030	12.43645
2035	15.67696
2040	17.89243
2045	18.88551
2050	18.92821
2055	19.35109
2060	20.43595
2065	21.22796
2070	22.21219
2075	23.47183
2080	24.86086
2085	25.90571
2090	26.75988
2095	27.60309
2100	28.50378