Year	Percent
1950	22.50449
1955	24.17927
1960	23.27324
1965	23.86873
1970	23.77061
1975	23.54362
1980	25.32465
1985	24.8982
1990	25.43246
1995	25.83657
2000	26.35777
2005	28.13127
2010	29.35589
2015	30.72045
2020	30.53347
2025	28.5589
2030	25.99978
2035	23.64797
2040	22.40911
2045	22.28356
2050	22.68849
2055	22.86083
2060	22.91652
2065	22.68424
2070	22.26946
2075	22.22074
2080	22.3306
2085	22.45251
2090	22.42849
2095	22.22873
2100	21.94612