CREATE TABLE table_28628 ("Region" TEXT, "Population" FLOAT, "% of countrys population" TEXT, "Change in population since 1993" FLOAT, "Change in % of countrys population since 1993" TEXT)

What is the change in population since 1993 in the region where the % of country's population was 4.2?
SELECT COUNT("Change in population since 1993") FROM table_28628 WHERE "% of countrys population" = '4.2'
SELECT COUNT("Change in population since 1993") FROM "table_28628" WHERE "% of countrys population" = '4.2'