Consider the following statements in the context of changes in the method of calculation of National Income.

1.    The base year has been shifted from 2004-05 to 2011-12.

2.    The key estimate for the level of GDP for 2011-12 is 2% lower than previous estimates 

3.    The growth surge in 2013-14 was accompanied by dramatic declines in savings and investment ratios, and also decline in imports. 

4.    Sector wise estimates of Gross Value Added are now to be given at basic prices, instead of factor cost.

5.    Headline growth is to be measured at constant market prices 

Which of the above statements are true?