2.2 Figure 3 in Part 1 of this report showed the rate of incidents where safety was compromised in recent years. Incidents where a risk of collision has existed have remained steady or dropped in recent years, despite increasing levels of traffic. It is as yet too early to say conclusively whether the NATS PPP has had any effect on safety. The independent UK Air Proximities Board's report on incidents in 2001 shows the lowest annual total of incidents since records of this type began in 1990. But the number of incidents reported shows no increase since the PPP's inception. The latest available data, based on NATS' internal assessment, indicate that there has been only one risk-bearing air proximity incident attributable to NATS to date (mid June) in the current calendar year.