Blue And Green

This is rare and I just notice it... This year the old road tax has 2 type color one is blue and one is green.
Normally is one years one color. How I realize it is I was looking at my car road tax gonna expire soon with the red color. Then I looking at my friend's car road tax his is blue... then I started curious coz I remember my Hulkjero road tax is green color. Then I asking people yes some of then also got blue and green.
This is really rare got like that lah can keep it for collection liao hehehe