Update including July 2nd, 2015:
North America
2012: 0 + 0 + 2 + 7 = 9
2013: 0 + 2 + 11 + 28 = 41
2014: 32 + 16 + 19 + 35 = 102
2015: 42 + 19 + 0 = 61
Total: 9 + 41 + 102 + 61 = 213
Europe
2013: 0 + 0 + 6 + 8 = 14
2014: 0 + 10 + 45 + 54 = 109
2015: 19 + 19 + 4 = 42
Total: 14 + 109 + 42 = 165
Asia Pacific (Currently: China, Japan, Australia)
2014: 0 + 3 + 16 + 39 = 58
2015: 16 + 5 + 0 = 21
Total: 58 + 21 = 79
Global total: 213 + 165 + 79 = 457
2012 Global total: 9 + 0 + 0 = 9
2013 Global total: 41 + 14 + 0 = 55
2014 Global total: 102 + 109 + 58 = 269
2015 Global total so far: 61 + 42 + 21 = 124
Q1 2013 total: 0 + 0 + 0 = 0
Q2 2013 total: 2 + 0 + 0 = 2
Q3 2013 total: 11 + 6 + 0 = 17
Q4 2013 total: 28 + 8 + 0 = 36
Q1 2014 total: 32 + 0 + 0 = 32
Q2 2014 total: 16 + 10 + 3 = 29
Q3 2014 total: 19 + 45 + 16 = 80
Q4 2014 total: 35 + 54 + 39 = 128
H1 2014: 32 + 29 = 61
H2 2014: 80 + 128 = 208
Q1 2015 total: 42 + 19 + 16 = 77
Q2 2015 total: 19 + 19 + 5 = 43
Q3 2015 (so far): 0 + 4 + 0 = 4 (in 2 days)
H1 2015: 77 + 43 = 120 (in 181 days)
H2 2015 (so far): 0 + 4 + 0 = 4
"About 2 new live Supercharger stations per 3 days (in H1 2015)". That looks like the going average these days. And that still is extraordinary progress.
Update including July 17th, 2015:
North America
2012: 0 + 0 + 2 + 7 = 9
2013: 0 + 2 + 11 + 28 = 41
2014: 32 + 16 + 19 + 35 = 102
2015: 42 + 19 + 7 = 68
Total: 9 + 41 + 102 + 68 = 220
Europe
2013: 0 + 0 + 6 + 8 = 14
2014: 0 + 10 + 44 + 54 = 108
2015: 19 + 19 + 11 = 49
Total: 14 + 108 + 49 = 171
Asia Pacific (Currently: China, Japan, Australia)
2014: 0 + 3 + 16 + 39 = 58
2015: 15 + 5 + 1 = 21
Total: 58 + 21 = 79
Global total: 220 + 171 + 79 = 470
2012 Global total: 9 + 0 + 0 = 9
2013 Global total: 41 + 14 + 0 = 55
2014 Global total: 102 + 108 + 58 = 268
2015 Global total so far: 68 + 49 + 21 = 138
Q1 2013 total: 0 + 0 + 0 = 0
Q2 2013 total: 2 + 0 + 0 = 2
Q3 2013 total: 11 + 6 + 0 = 17
Q4 2013 total: 28 + 8 + 0 = 36
Q1 2014 total: 32 + 0 + 0 = 32
Q2 2014 total: 16 + 10 + 3 = 29
Q3 2014 total: 19 + 44 + 16 = 79
Q4 2014 total: 35 + 54 + 39 = 128
H1 2014: 32 + 29 = 61
H2 2014: 79 + 128 = 207
Q1 2015 total: 42 + 19 + 15 = 76
Q2 2015 total: 19 + 19 + 5 = 43
Q3 2015 (so far): 7 + 11 + 1 = 19 (in 17 days)
H1 2015: 76 + 43 = 119 (in 181 days)
H2 2015 (so far): 7 + 11 + 1 = 19
"138 new live Supercharger stations in 198 days (in 2015). The average is almost 0.7 per day (in 2015)". That looks like the going average these days. And that still is extraordinary progress.