Year	Percent
1950	15.41465
1955	15.47431
1960	16.49248
1965	17.41464
1970	18.23488
1975	18.50833
1980	17.00114
1985	17.13314
1990	21.46162
1995	23.29694
2000	25.49186
2005	26.42476
2010	28.08582
2015	30.11736
2020	31.86265
2025	33.30808
2030	34.25783
2035	35.72449
2040	36.85412
2045	38.24185
2050	40.02879
2055	40.19576
2060	39.01556
2065	38.41952
2070	39.0128
2075	39.1985
2080	39.37516
2085	39.41982
2090	39.27459
2095	39.27469
2100	39.61378