For the purpose of carrying out this subpart, there are authorized to be appropriated $1,195,500,000 for fiscal year 2007, $1,239,500,000 for fiscal year 2008, $1,285,200,000 for fiscal year 2009, $1,349,460,000 for fiscal year 2010, $1,416,933,000 for fiscal year 2011, $1,487,780,000 for fiscal year 2012, and $1,562,169,000 for fiscal year 2013. Amounts appropriated under the preceding sentence for a fiscal year are available for obligation by the Secretary until the end of the second succeeding fiscal year.