I cannot answer that, but I can tell you that the enhancement is structured very differently than the base benefit and that it adapts much better to the situation. The enhancement is based on years of service. We always use the best 40 years to calculate the pension.
When it comes to the base benefit, we are talking about an average of years. If we calculate an average, we take out the low earnings and periods. That does not happen in the case of the enhancement. The enhancement is always based on an accumulation. Rather than including zeros, we are crediting people with earnings. This practice is used in many countries, including Belgium, Sweden, and Japan. Systems that exclude earnings are the exception rather than the rule.