Update including November 18th, 2015:
North America
2012: 0 + 0 + 2 + 7 = 9
2013: 0 + 2 + 11 + 28 = 41
2014: 32 + 16 + 19 + 35 = 102
2015: 42 + 19 + 22 + 18 = 101
Total: 9 + 41 + 102 + 101 = 253
Europe
2013: 0 + 0 + 6 + 8 = 14
2014: 0 + 10 + 44 + 54 = 108
2015: 19 + 19 + 32 + 9 = 79
Total: 14 + 108 + 79 = 201
Asia Pacific (Currently: China, Japan, Australia)
2014: 0 + 3 + 16 + 39 = 58
2015: 15 + 5 + 15 + 11 = 46
Total: 58 + 46 = 104
Global total: 253 + 201 + 104 = 558
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: 101 + 79 + 46 = 226
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 total: 22 + 32 + 15 = 69 (in 92 days)
Q4 2015 (so far): 18 + 9 + 11 = 38 (in 49 days)
H1 2015: 76 + 43 = 119 (in 181 days)
H2 2015 (so far): 40 + 41 + 26 = 107 (in 141 days)
"226 new live Supercharger stations in 322 days (in 2015). The average is more than 0.7018 per day (in 2015)". That looks like the going average these days. The average in 2014 was 0.7342 (= 268/365). And that still is extraordinary progress, although the average in 2015 (so far) is lower than the average in 2014.
Update including November 28th, 2015:
North America
2012: 0 + 0 + 2 + 7 = 9
2013: 0 + 2 + 11 + 28 = 41
2014: 32 + 16 + 19 + 35 = 102
2015: 42 + 19 + 22 + 18 = 101
Total: 9 + 41 + 102 + 101 = 253
Europe
2013: 0 + 0 + 6 + 8 = 14
2014: 0 + 10 + 44 + 54 = 108
2015: 19 + 19 + 32 + 11 = 81
Total: 14 + 108 + 81 = 203
Asia Pacific (Currently: China, Japan, Australia)
2014: 0 + 3 + 16 + 39 = 58
2015: 15 + 5 + 15 + 12 = 47
Total: 58 + 47 = 105
Global total: 253 + 203 + 105 = 561
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: 101 + 81 + 47 = 229
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 total: 22 + 32 + 15 = 69 (in 92 days)
Q4 2015 (so far): 18 + 11 + 12 = 41 (in 59 days)
H1 2015: 76 + 43 = 119 (in 181 days)
H2 2015 (so far): 40 + 43 + 27 = 110 (in 151 days)
"229 new live Supercharger stations in 332 days (in 2015). The average is more than 0.6897 per day (in 2015)". That looks like the going average these days. The average in 2014 was 0.7342 (= 268/365). And that still is extraordinary progress, although the average in 2015 (so far) is lower than the average in 2014.