Nokia (Finland) is still among the leaders in the telecommunication industry, with emphasis on cellular phones and other wireless solutions. The consolidated financial statements are prepared in accordance with International Financial Reporting Standards. We disclose below the consolidated balance sheets at 31 December 2007 to 2011 (Source: Annual reports 2007-2011) as well as some additional information (2007-2011).


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Required
Compute the three following ratios based on equity, as defined by the company in its annual report:
1. Return on shareholders' equity (%): (Profit attributable to the equity holders of the parent) / (average capital and [retained earnings and] reserves attributable to the company's equity holders during the year).
2. Equity ratio (%): (capital and [retained earnings and] reserves attributable to the company's equity holders plus minority shareholders' interests) / (Total assets minus advance payments received).
3. Net debt to equity (gearing ratio) (%): (Long-term interest-bearing liabilities [including the current portion thereof] plus short-term borrowings minus cash and other liquid assets) / (capital and [retained earnings and] reserves attributable to the equity holders of the parent plus minority shareholders' interests).
4. Comment on the evolution of these ratios.