In Europe, regular people interested in fuel economy buy their Golfs with a 1.6 TDI. The 2.0 TDI 140hp is a "trade off fuel economy for more power" option only 5.9% of buyers choose. The GTD percentage is 3.7%, as the amplified performance version.
Regular people who don't drive a lot buy a gasser, traditionally the least powerful (~80hp) one is the best selling, because it's the cheapest to buy.
Here's the percentages for 2010. I'll try to dig up newer ones.
1.4 80hp: 18,5%
1.2 TSI 85hp: 2,7% (SOP KW32/2010)
1.6 102hp: 3,0%
1.6 102hp BiFuel: 0,3% (LPG/gasoline dual fuel)
1.2 TSI 105hp: 10,5%
1.2 TSI 105hp BMT: 3,1%
1.4 TSI 122hp: 17,1%
1.4 TSI 160hp: 4,0% (twincharged 1.4)
2.0 TSI 210hp: 5,9% (GTI)
2.0 TSI 235hp: 1,4% (GTI Edition 35)
1.6 TDI 105hp: 17,5%
1.6 TDI 105hp BMT: 6,4%
2.0 TDI 140hp: 5,9%
2.0 TDI 170hp: 3,7% (GTD)
(The Mk7 lineup is simpler at the moment: No naturally aspirated 1.4 and 1.6 anymore, those have been replaced by 1.2TSI variants. No more twincharged 1.4 160hp.)