Year	Percent
1950	5.19555
1955	5.14346
1960	5.11095
1965	5.13979
1970	5.20095
1975	5.32407
1980	5.52159
1985	5.75327
1990	6.91297
1995	7.39901
2000	8.00024
2005	8.76932
2010	9.69137
2015	10.83842
2020	12.28987
2025	14.00261
2030	15.87968
2035	17.85316
2040	19.6925
2045	21.35458
2050	22.90897
2055	24.32994
2060	25.76935
2065	27.10053
2070	28.44597
2075	29.86417
2080	31.16603
2085	32.38289
2090	33.52695
2095	34.58109
2100	35.52721