Year	Percent
1950	13.78633
1955	15.0684
1960	13.86694
1965	14.9397
1970	15.17369
1975	13.65074
1980	11.54574
1985	11.78797
1990	12.04261
1995	11.58508
2000	10.5411
2005	9.45975
2010	8.10389
2015	7.66642
2020	7.09937
2025	6.64277
2030	6.17015
2035	5.78079
2040	5.46618
2045	5.22069
2050	5.05871
2055	4.92599
2060	4.81135
2065	4.70333
2070	4.63189
2075	4.59047
2080	4.57847
2085	4.58351
2090	4.5846
2095	4.58082
2100	4.57366