A person used to save $20\mathrm{\%}$ of his income. Since his income has increased by $20\mathrm{\%}$ , he started giving $10\mathrm{\%}$ of the income to a charity. Now, he is saving $16.66\mathrm{\%}$ of his net income (after donation to the charity). Find the percentage change in his saving percent (Saving percent is defined as the savings of the person as a percentage of his income).