Try to use following data for your CSV:
Month,2009,2010,2011,2012,2013,2014
string,number,number,number,number,number,number
Janu.,6698000,4845000,5560000,4491000,6050000,6975977
Febr.,5965000,6648000,7370000,7490000,6795000,
Mars,7530000,7266000,7756000,6590000,5988550,
Apri.,9769000,7515000,6300000,6010000,8230000,
Mai,6248000,5985000,7977000,6300000,7351288,
Juni,6873000,7186000,7290000,7120000,6934738,
Juli,3438000,3487000,3183000,1600000,3324522,
Augu.,6294000,6674000,7782000,5790000,6565288,
Sept.,8178000,7250000,7200000,6500000,9540000,
Okto.,7412000,7850000,6966000,6906000,7891439,
Nove.,7300000,9628000,7542000,6400000,8267000,
Dese.,7066000,8328000,7200000,6050000,7822429,
Some notes:
1. Add data type at the second line of the file. It has to be string and number in your case.
2. Do not add any spaces, commas or else characters to the number values
Let me know how it works.