Import prices of natural gas and gas consumer prices

Year-on-year change rate in percent
Month	Natural gas	Gas, consumer prices
... = Data will be available later. Source: Statistisches Bundesamt, Wiesbaden
October 2007	-8.2	-1.6
November 2007	-5.8	-2.5
December 2007	-0.8	-2.5
January 2008	7.4	-1.6
February 2008	12.3	-1.4
March 2008	19.6	-1.1
April 2008	33.2	3.6
May 2008	36.2	4.7
June 2008	42.9	5.3
July 2008	53.6	8.1
August 2008	55.4	10.2
September 2008	61.6	14.1
October 2008	...	21.4

What are ...