Year	Percent
1950	14.10295
1955	14.20092
1960	13.92511
1965	13.92259
1970	14.23898
1975	14.35273
1980	14.71705
1985	14.79152
1990	15.42133
1995	16.82262
2000	18.36241
2005	20.43345
2010	22.14417
2015	23.43438
2020	24.94912
2025	26.49955
2030	27.67912
2035	28.48543
2040	28.78581
2045	28.20808
2050	27.36894
2055	26.68978
2060	25.8221
2065	25.16796
2070	24.78904
2075	24.30476
2080	23.85749
2085	23.51507
2090	23.29364
2095	23.13497
2100	23.00367