Update including May 3rd, 2015:
North America
2012: 0 + 0 + 2 + 7 = 9
2013: 0 + 2 + 11 + 28 = 41
2014: 32 + 16 + 19 + 35 = 102
2015: 42 + 8 = 50
Total: 9 + 41 + 102 + 50 = 202
Europe
2013: 0 + 0 + 6 + 8 = 14
2014: 0 + 10 + 45 + 54 = 109
2015: 19 + 6 = 25
Total: 14 + 109 + 25 = 148
Asia Pacific (Currently: China, Japan, Australia)
2014: 0 + 3 + 16 + 39 = 58
2015: 16 + 2 = 18
Total: 58 + 18 = 76
Global total: 202 + 148 + 76 = 426
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: 50 + 25 + 18 = 93
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
First half of 2014: 32 + 29 = 61
Second half of 2014: 80 + 128 = 208
Q1 2015 total: 42 + 19 + 16 = 77
Q2 2015 so far: 8 + 6 + 2 = 16 (in 33 days)
"A little less than 1 new live Supercharger station per 2 days (in Q2 2015)". That looks like the going average these days. And that still is extraordinary progress.
Update including June 17th, 2015:
North America
2012: 0 + 0 + 2 + 7 = 9
2013: 0 + 2 + 11 + 28 = 41
2014: 32 + 16 + 19 + 35 = 102
2015: 42 + 16 = 58
Total: 9 + 41 + 102 + 58 = 210
Europe
2013: 0 + 0 + 6 + 8 = 14
2014: 0 + 10 + 45 + 54 = 109
2015: 19 + 15 = 34
Total: 14 + 109 + 34 = 157
Asia Pacific (Currently: China, Japan, Australia)
2014: 0 + 3 + 16 + 39 = 58
2015: 16 + 4 = 20
Total: 58 + 20 = 78
Global total: 210 + 157 + 78 = 445
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: 58 + 34 + 20 = 112
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
First half of 2014: 32 + 29 = 61
Second half of 2014: 80 + 128 = 208
Q1 2015 total: 42 + 19 + 16 = 77
Q2 2015 so far: 16 + 15 + 4 = 35 (in 78 days)
"A little less than 1 new live Supercharger station per 2 days (in Q2 2015)". That looks like the going average these days. And that still is extraordinary progress.