Year	Percent
1950	29.10353
1955	29.92703
1960	30.25276
1965	30.37629
1970	29.20698
1975	28.9869
1980	28.46979
1985	28.07823
1990	27.63685
1995	27.76467
2000	27.94077
2005	27.33451
2010	27.34456
2015	28.11625
2020	28.89628
2025	29.49635
2030	29.83939
2035	30.13663
2040	30.38425
2045	30.69825
2050	30.99638
2055	31.12069
2060	31.10577
2065	31.05664
2070	30.98988
2075	30.88519
2080	30.75614
2085	30.60338
2090	30.43703
2095	30.26605
2100	30.08174