Arctic warms the most when the climate change happens, it is expected that we'll see there the most of records most often broken.
The interactive charting:
Actually top 5 are - 1921, 1921, 1959, 1921, 1994.
Not denying heatwaves but the news reporting seems skewed a bit. We had heatwaves in Western Europe while fairly cold summer in Eastern Europe due to jetstream this year. But 'Heatwave in Paris' makes better headline then 'Cold summer in Minsk'.
Saddly jetstream and its consequences is still poorly understood by science.