b'2015 2014 2013 2012 2011 2010$587,816 $562,272 $448,347 $366,827 $372,079 $374,823(587,816) (562,272) (448,347) (366,827) (372,079) (374,823)$0 $0 $0 $0 $0 $0$2,758,835 $2,645,273 $2,474,047 $2,451,108 $2,479,887 $2,501,84021.31% 21.26% 18.12% 14.97% 15.00% 14.98%$13,794 $13,226 $89,478 $165,450 $167,392 $168,875(13,794) (13,226) (89,478) (165,450) (167,392) (168,875)$0 $0 $0 $0 $0 $00.50% 0.50% 3.62% 6.75% 6.75% 6.75%21.81% 21.76% 21.74% 21.72% 21.75% 21.73%- 91 -'