Year	Percent
1950	4.19535
1955	4.66188
1960	5.41595
1965	6.08258
1970	6.28728
1975	6.10105
1980	5.75274
1985	5.34152
1990	5.54897
1995	5.32756
2000	5.18211
2005	5.06573
2010	4.75185
2015	5.01735
2020	4.98236
2025	5.20329
2030	5.95202
2035	6.80074
2040	7.64656
2045	8.40281
2050	9.14716
2055	9.88213
2060	10.67459
2065	11.42812
2070	12.33742
2075	13.42386
2080	14.52563
2085	15.62492
2090	16.75227
2095	17.92974
2100	19.15437