The table below shows the annual change in the average nominal wage and inflation rate since $2008.$

a$.$ Compute the percentage change in real income for each year shown in the table.

Instructions: In part a$,$ round your answers to $2$ decimal places. In parts b and c$,$ enter your answers as a whole num negative number include a minus sign.

Percentage Changes in Nominal Income and Prices

$\backslash$table$[[$Year$,\backslash$table$[[$Annual$],[$Inflation$],[$Rate$],[($percent$)]],\backslash$table$[[$Annual$],[$Nominal Wage$],[$Growth$],[($percent$)]],\backslash$table$[[$Annual Real Wage$],[$Growth$],[($percent$)]],],[2008,4\mathrm{.}088,0\mathrm{.}358,,,8],[2009,-0\mathrm{.}37,-1\mathrm{.}31,,,],[2010,1\mathrm{.}71,-0\mathrm{.}79,,,],[2011,3\mathrm{.}4,1\mathrm{.}48,,,],[2012,2\mathrm{.}18,2\mathrm{.}91,,,],[2013,1\mathrm{.}51,2\mathrm{.}39,,,]]$

b$.$ Of the years listed above, the paycheck of the average worker declined in $$ of the six years.

c$.$ Of the years listed above, the purchasing power of the average worker declined in $$ of the six years.

d$.$ The average real income of households can increase $$