Year	Percent
1950	14.71284
1955	14.70153
1960	14.66546
1965	15.06111
1970	13.76779
1975	14.04239
1980	14.0665
1985	12.13115
1990	10.19817
1995	9.02225
2000	8.98879
2005	10.00964
2010	11.19547
2015	12.15425
2020	14.06443
2025	14.52729
2030	15.65569
2035	16.14695
2040	16.18861
2045	17.55347
2050	18.59281
2055	19.89851
2060	20.81022
2065	21.25904
2070	21.64679
2075	22.08367
2080	22.60387
2085	23.08541
2090	23.45577
2095	23.73243
2100	23.95468