Year	Percent
1950	11.0703
1955	10.56192
1960	10.22631
1965	11.09313
1970	12.11259
1975	12.17067
1980	10.81749
1985	10.23397
1990	12.6149
1995	14.26495
2000	15.92953
2005	17.00602
2010	17.73426
2015	19.35198
2020	21.26676
2025	23.0963
2030	24.19879
2035	25.67573
2040	26.75768
2045	28.30405
2050	30.32921
2055	31.06306
2060	29.64106
2065	29.0786
2070	29.94841
2075	30.75184
2080	31.38215
2085	31.85246
2090	31.99017
2095	31.96357
2100	32.16809