There have been an average of 54 normal and DRS overtakes per race in 2012 - compared to a 2011 season average of 43.

There has been more normal overtaking in 2012 (68%) compared to a 2011 season average of 55%. There has also been more normal overtaking than DRS overtaking at every race so far in 2012.

For many years, a Grand Prix in Barcelona was synonymous with almost no overtaking - there were an average of just two overtaking moves per race between 2008 and 2010. That all changed last year: not only did 'normal' (i.e. non-DRS assisted) overtakes increase by a factor of ten - with a total of 22 - but DRS enabled a further 29 overtakes, for a race total of 51; in other words, 25 times more than in the previous three years.

With much discussion about the most unpredictable start to a Formula One season for nearly 30 years, with four winners from as many races, and eight different drivers from six teams on the podium so far this season, has the composition of the racing changed materially compared to 2011?

The raw total for the number of passes the first four races of 2012 is remarkably similar to that from 2011 - 327 compared to 326 in 2011. This figure includes passes made because of damage, and those on cars from the three slowest teams, but does not include position changes on lap one.

In 2011, there were a total of 220 normal and DRS overtakes in the first four races (NB: this figure does not include passes on the slowest three teams by faster cars); in 2012, there have been 215. However, in 2011, these were split 50:50 between normal and DRS overtakes in the first four races. In 2012, this split has been 68:32 in favour of normal overtaking. This compares to a season average from 2011 of 55:45 between normal and DRS overtaking, suggesting that the amount of normal overtaking has seen a significant proportional increase relative to last year.

In the first four races of 2011, there were two (China, Turkey) in which the number of DRS overtakes exceeded the total normal overtakes. Overall, there were eight of 19 races in 2011 at which DRS overtaking exceeded normal. So far in 2012, this has not occurred - in other words, there has been more normal overtaking than DRS overtaking at every race this year. However, it does not necessarily follow that DRS is becoming less influential; for example, even if a following driver does not pass in the DRS zone, the lap time advantage the DRS provides can help with conserving tyres, or allow the strategic deployment of KERS elsewhere on the circuit to pass outside the DRS zone.

In 2011, the average number of normal and DRS overtakes per race was 43. So far, there have been on average 54 moves per race in 2012 - a clear increase on 2011. However, by way of direct comparison, the first four races of 2011 saw an average of 55 moves.

The most meaningful comparisons so far can be drawn from the races in Australia and China, which were run on the same circuits and in similar conditions both years. The 2011 season opener (the first race at which DRS was ever used) featured a total of 17 normal and DRS passes; in 2012, there was exactly twice as much passing - 34 overtakes in total.