Year	Percent
1950	18.31013
1955	18.34684
1960	19.01009
1965	19.59532
1970	19.52195
1975	19.72128
1980	19.49627
1985	18.83232
1990	18.4409
1995	18.28536
2000	18.47761
2005	18.59861
2010	17.86913
2015	17.08233
2020	16.58162
2025	16.07799
2030	15.47518
2035	14.80012
2040	14.1343
2045	13.54629
2050	13.00742
2055	12.49775
2060	11.95867
2065	11.453
2070	10.9769
2075	10.53797
2080	10.12369
2085	9.7169
2090	9.32339
2095	8.94705
2100	8.58707