Year	Percent
1950	29.7121
1955	28.31676
1960	28.69853
1965	26.82387
1970	26.70248
1975	28.3889
1980	29.80824
1985	30.24646
1990	29.48004
1995	28.75932
2000	29.37202
2005	30.25165
2010	30.54108
2015	29.29005
2020	26.27248
2025	23.27773
2030	21.21032
2035	20.15988
2040	20.42791
2045	20.9958
2050	20.82858
2055	20.26769
2060	19.73023
2065	19.5633
2070	19.88453
2075	20.482
2080	20.91131
2085	20.91685
2090	20.63237
2095	20.34892
2100	20.25698