The Sorka Corp. has paid annual dividends of $$0\mathrm{.}54,$ $$100,$ $$0\mathrm{.}75,$ $$0\mathrm{.}83,$ $$0\mathrm{.}58$ and $$0\mathrm{.}82,$ respectively, over the past several years. What is the dividend growth rate? $($Round to one decimal place. The $$100$ dividend in the $2$nd year is NOT a typo. It's a special dividend paid by the firm due to a capital restructuring scheme.