Year, Cumulative Savings
1978, 0.76 
1979, 11.38 
1980, 42.25 
1981, 79.29 
1982, 143.66 
1983, 236.71 
1984, 271.71 
1985, 301.37 
1986, 334.34 
1987, 365.65 
1988, 408.27 
1989, 461.57 
1990, 527.78 
1991, 585.22 
1992, 691.91 
1993, 852.24 
1994, 1015.20 
1995, 1214.70 
1996, 1380.52 
1997, 1523.27 
1998, 1674.63 
1999, 1828.59 
2000, 1987.77 
2001, 2226.53 
2002, 2470.95 
2003, 2685.88 
2004, 2908.87 
2005, 3152.56 
2006, 3406.63 
2007, 3724.48 
2008, 4070.88 
2009, 4414.75 
2010, 4710.22 
2011, 5028.78 
2012, 5314.39 
2013, 5621.58 
2014, 5915.57 
2015, 6224.45 
2016, 6427.81 
2017, 6636.51 
2018, 6864.99 
2019, 7081.86