Update including December 23rd, 2015:
North America
2012: 0 + 0 + 0 + 7 = 7
2013: 0 + 2 + 13 + 28 = 43
2014: 32 + 16 + 19 + 35 = 102
2015: 42 + 19 + 22 + 25 = 108
Total: 7 + 43 + 102 + 108 = 260
Europe
2013: 0 + 0 + 6 + 8 = 14
2014: 0 + 10 + 43 + 53 = 106
2015: 19 + 19 + 32 + 23 = 93
Total: 14 + 106 + 93 = 213
Asia Pacific (Currently: China, Japan, Australia)
2014: 0 + 3 + 16 + 39 = 58
2015: 15 + 5 + 15 + 18 = 53
Total: 58 + 53 = 111
Global total: 260 + 213 + 111 = 584
2012 Global total: 7 + 0 + 0 = 7
2013 Global total: 43 + 14 + 0 = 57
2014 Global total: 102 + 106 + 58 = 266
2015 Global total so far: 108 + 93 + 53 = 254
Q1 2013 total: 0 + 0 + 0 = 0
Q2 2013 total: 2 + 0 + 0 = 2
Q3 2013 total: 13 + 6 + 0 = 19
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 + 43 + 16 = 78
Q4 2014 total: 35 + 53 + 39 = 127
H1 2014: 32 + 29 = 61
H2 2014: 78 + 127 = 205
Q1 2015 total: 42 + 19 + 15 = 76
Q2 2015 total: 19 + 19 + 5 = 43
Q3 2015 total: 22 + 32 + 15 = 69 (in 92 days)
Q4 2015 (so far): 25 + 23 + 18 = 66 (in 84 days)
H1 2015: 76 + 43 = 119 (in 181 days)
H2 2015 (so far): 47 + 55 + 33 = 135 (in 176 days)
"254 new live Supercharger stations in 357 days (in 2015). The average is more than 0.7114 per day (in 2015)". That looks like the going average these days. The average in 2014 was 0.7287 (= 266/365). And that still is extraordinary progress, although the average in 2015 (so far) is lower than the average in 2014.
Update including December 31st, 2015:
North America
2012: 0 + 0 + 0 + 7 = 7
2013: 0 + 2 + 13 + 28 = 43
2014: 32 + 16 + 19 + 35 = 102
2015: 42 + 19 + 22 + 30 = 113
Total: 7 + 43 + 102 + 113 = 265
Europe
2013: 0 + 0 + 6 + 8 = 14
2014: 0 + 10 + 42 + 53 = 105
2015: 19 + 19 + 32 + 24 = 94
Total: 14 + 105 + 94 = 213
Asia Pacific (Currently: China, Japan, Australia)
2014: 0 + 3 + 16 + 39 = 58
2015: 15 + 5 + 15 + 19 = 54
Total: 58 + 53 = 112
Global total: 265 + 213 + 112 = 590
2012 Global total: 7 + 0 + 0 = 7
2013 Global total: 43 + 14 + 0 = 57
2014 Global total: 102 + 105 + 58 = 265
2015 Global total: 113 + 94 + 54 = 261
Q1 2013 total: 0 + 0 + 0 = 0
Q2 2013 total: 2 + 0 + 0 = 2
Q3 2013 total: 13 + 6 + 0 = 19
Q4 2013 total: 28 + 8 + 0 = 36
H1 2013: 0 + 2 = 2
H2 2013: 19 + 36 = 55
Q1 2014 total: 32 + 0 + 0 = 32
Q2 2014 total: 16 + 10 + 3 = 29
Q3 2014 total: 19 + 42 + 16 = 77
Q4 2014 total: 35 + 53 + 39 = 127
H1 2014: 32 + 29 = 61
H2 2014: 77 + 127 = 204
Q1 2015 total: 42 + 19 + 15 = 76
Q2 2015 total: 19 + 19 + 5 = 43
Q3 2015 total: 22 + 32 + 15 = 69
Q4 2015 total: 30 + 24 + 19 = 73
H1 2015: 76 + 43 = 119
H2 2015: 69 + 73 = 142
"261 new live Supercharger stations in 365 days (in 2015). The average is more than 0.7150 per day (in 2015)". That looks like the going average these days. The average in 2014 was 0.7260 (= 265/365). The total for 2014 + 2015 = 526. And that sure is extraordinary progress. Let's see how that will continue in 2016, 2017, etc.