Table:
previously-published average level
revised average level
average revision

millions of dollars

average 2014 to 2016

compensation of employees
1,024,734
1,023,127
-1,607

gross operating surplus
524,549
530,666
6,117

gross mixed income
231,338
232,080
741

taxes less subsidies on production
86,495
87,560
1,065

taxes less subsidies on products
131,021
133,227
2,205

gdp at market prices
1,998,951
2,006,867
7,915

2014

compensation of employees
997,998
998,463
465

gross operating surplus
553,497
557,281
3,784

gross mixed income
221,340
222,458
1,118

taxes less subsidies on production
84,358
84,321
-37

taxes less subsidies on products
125,003
127,138
2,135

gdp at market prices
1,983,117
1,990,183
7,066

2015

compensation of employees
1,025,682
1,026,914
1,232

gross operating surplus
511,680
515,737
4,057

gross mixed income
230,907
232,366
1,459

taxes less subsidies on production
86,079
87,853
1,774

taxes less subsidies on products
130,752
133,099
2,347

gdp at market prices
1,986,193
1,994,911
8,718

2016

compensation of employees
1,050,522
1,044,005
-6,517

gross operating surplus
508,469
518,979
10,510

gross mixed income
241,768
241,415
-353

taxes less subsidies on production
89,048
90,507
1,459

taxes less subsidies on products
137,309
139,443
2,134

gdp at market prices
2,027,544
2,035,506
7,962

Statement: estimates of gross mixed income were revised up in 2014 and 2015 only.
Question: which year did estimates of gross mixed income revise up?
Answer: [2014.0, 2015.0]