Year	Percent
1950	18.45045
1955	17.79359
1960	17.46712
1965	17.14998
1970	16.73381
1975	16.53405
1980	15.85795
1985	15.23788
1990	14.55104
1995	14.43436
2000	13.85029
2005	13.17701
2010	13.0283
2015	12.54061
2020	11.99877
2025	11.60221
2030	12.4034
2035	14.01958
2040	15.97456
2045	17.67105
2050	19.03944
2055	20.20837
2060	21.18714
2065	22.15778
2070	22.89844
2075	23.49027
2080	23.90436
2085	24.16799
2090	24.34515
2095	24.47347
2100	24.54325