Year	Percent
1950	14.03964
1955	13.90374
1960	13.88551
1965	13.72124
1970	13.38615
1975	12.93519
1980	12.50567
1985	12.25654
1990	12.06036
1995	11.94213
2000	12.02463
2005	12.16083
2010	12.53343
2015	13.31346
2020	14.36353
2025	15.40274
2030	16.2637
2035	16.7419
2040	17.16669
2045	17.9534
2050	18.98825
2055	20.05516
2060	20.92837
2065	21.48602
2070	21.91696
2075	22.41093
2080	22.97301
2085	23.51872
2090	23.97386
2095	24.35909
2100	24.70133