Math stagnation nations (Western OECDs)

Math stagnation patterns of the past 15 years from the PISA math tests (2003-2018)

OECD 30 countries
5 Romance language OECD countries
6 Germanic-Nordic OECD countries
6 English-speaking OECD countries

As you can see clearly, the (vast) majority of these western OECD countries have become flat horizontal without progress at all or even got worse over the past 15 years in PISA math tests.

NOTE:

Notice that these western OECD countries have their math poverty ranging typically about 20-25% of the student population (in PISA).
The black dotted horizontal lines are the math poverty cutoff point of about 420 in PISA math (which is equivalent to my definition of the mathe poverty).
the 3 steep arrows to the right of each of the chart of the math stagnation nations are the steep math poverty ending if the Ministry/Departments of Education embrace the MMU operations. The size of the arrows depend on the levels of the commitments.