Year	Percent
1950	23.13999
1955	23.06798
1960	22.75669
1965	22.95065
1970	22.52723
1975	21.51762
1980	21.10655
1985	21.14008
1990	22.5914
1995	24.43329
2000	26.38226
2005	27.72531
2010	26.44456
2015	26.04272
2020	25.06694
2025	24.86431
2030	25.17951
2035	25.22676
2040	25.07874
2045	24.25409
2050	23.76244
2055	23.55152
2060	23.96215
2065	24.32109
2070	24.18556
2075	23.8472
2080	23.40604
2085	23.16537
2090	23.10531
2095	23.10693
2100	23.02072