,direct,indirect
1981,0.47 ,0.11 
1982,0.51 ,0.12 
1983,0.55 ,0.12 
1984,0.59 ,0.13 
1985,0.60 ,0.14 
1986,0.63 ,0.15 
1987,0.67 ,0.17 
1988,0.69 ,0.20 
1989,0.74 ,0.22 
1990,0.81 ,0.22 
1991,0.84 ,0.31 
1992,0.89 ,0.30 
1993,0.96 ,0.38 
1994,1.03 ,0.41 
1995,1.12 ,0.43 
1996,1.14 ,0.51 
1997,1.18 ,0.51 
1998,1.25 ,0.44 
1999,1.30 ,0.43 
2000,1.30 ,0.49 
2001,1.31 ,0.49 
2002,1.34 ,0.53 
2003,1.37 ,0.51 
2004,1.43 ,0.45 
2005,1.50 ,0.64 
2006,1.53 ,0.49 
2007,1.55 ,0.57 
2008,1.63 ,0.48 
2009,1.67 ,0.53 
2010,1.72 ,0.67 
2011,1.76 ,0.71 
2012,1.84 ,0.82 
2013,1.87 ,0.75 
2014,1.90 ,0.69 
2015,1.94 ,0.57 
2016,1.95 ,0.67 
2017,1.96 ,0.68