Year	Percent
1950	5.68913
1955	4.73936
1960	4.46627
1965	4.39218
1970	4.46434
1975	4.56015
1980	4.60297
1985	4.72243
1990	5.29946
1995	5.4562
2000	5.57917
2005	5.72966
2010	6.03642
2015	6.62796
2020	7.2329
2025	7.86465
2030	8.55236
2035	9.35627
2040	10.26897
2045	11.20066
2050	12.03112
2055	12.93678
2060	14.09091
2065	15.28859
2070	16.48565
2075	17.59541
2080	18.68493
2085	19.78281
2090	20.88295
2095	21.98849
2100	23.08664