Year	Percent
1950	13.88683
1955	14.12164
1960	14.29297
1965	14.50016
1970	14.46741
1975	14.22253
1980	13.97877
1985	13.64873
1990	13.05607
1995	12.89623
2000	12.8093
2005	12.7416
2010	13.1028
2015	13.60266
2020	14.24375
2025	14.98088
2030	15.57224
2035	16.00775
2040	16.75626
2045	17.74938
2050	18.80622
2055	19.79945
2060	20.53788
2065	21.09094
2070	21.63766
2075	22.21683
2080	22.74176
2085	23.16855
2090	23.4995
2095	23.76756
2100	23.98278