Year	Percent
1950	5.12474
1955	5.008
1960	5.09082
1965	5.39264
1970	5.64328
1975	5.59117
1980	5.30452
1985	5.32769
1990	5.57348
1995	5.58259
2000	5.37105
2005	5.36083
2010	5.72175
2015	5.55282
2020	5.02191
2025	4.42611
2030	4.14075
2035	4.35634
2040	5.16173
2045	6.61051
2050	8.40175
2055	10.22202
2060	11.98953
2065	13.33107
2070	14.56742
2075	16.16439
2080	17.84342
2085	19.39771
2090	20.76619
2095	22.04244
2100	23.27626