Returns pre-calculated financial ratios.

Retrieves pre-calculated financial ratios for specified securities. Available ratio subcategories include FINANCIAL, GROWTH_RATE, LIQUIDITY, PROFITABILITY, SIZE, and VALUATION. Common ratios include price-to-earnings (FF_PE), return on equity (FF_ROE), debt-to-equity (FF_DEBT_EQUITY), current ratio (FF_CURR_RATIO), and many others.