Year	Percent
1950	3.90082
1955	3.62399
1960	3.45698
1965	3.71496
1970	3.93248
1975	4.05499
1980	4.57855
1985	4.37568
1990	4.81123
1995	4.98624
2000	4.71037
2005	4.67547
2010	4.84414
2015	4.89749
2020	4.97548
2025	5.09765
2030	5.47866
2035	6.13289
2040	6.85717
2045	7.90377
2050	9.13289
2055	10.81202
2060	12.85118
2065	14.87698
2070	16.7079
2075	18.5505
2080	20.37843
2085	22.17414
2090	23.88552
2095	25.51196
2100	27.04571