Year	Percent
1950	15.66405
1955	15.44982
1960	15.43424
1965	14.15912
1970	14.27562
1975	14.64779
1980	14.96162
1985	15.14958
1990	14.79057
1995	15.66872
2000	17.58999
2005	20.53022
2010	23.39221
2015	24.23041
2020	25.21934
2025	26.46559
2030	27.45787
2035	27.82937
2040	26.60053
2045	24.47328
2050	22.79815
2055	23.18677
2060	24.33433
2065	25.35278
2070	25.44476
2075	24.13428
2080	23.05948
2085	22.69611
2090	22.95574
2095	23.33627
2100	23.33463