Year	Percent
1950	5.29926
1955	4.84196
1960	4.19049
1965	3.89508
1970	3.42746
1975	3.05165
1980	2.9607
1985	3.07077
1990	3.28015
1995	3.48181
2000	3.78416
2005	4.1096
2010	4.45086
2015	5.11725
2020	5.74125
2025	6.36311
2030	7.23363
2035	8.63466
2040	10.78145
2045	13.39549
2050	15.57818
2055	17.31989
2060	18.62365
2065	19.62047
2070	20.74442
2075	22.29147
2080	23.76061
2085	25.04947
2090	26.12096
2095	27.03303
2100	27.86158