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AutoIt - 60 58 56 bytes

$_=@YEAR-2e3 ClipPut(($_-Int($_/4-1))/10+6&' 3'&3*$_-20) 

The rounding eats bytes (not anymore). I have now tweaked both formulas. Some sample outputs:

7.3 325 // 2015 7.3 328 7.4 331 7.5 334 // 2018 8.4 370 // 2030 

They all seem to be accurate.

AutoIt - 60 58 56 bytes

$_=@YEAR-2e3 ClipPut(($_-Int($_/4-1))/10+6&' 3'&3*$_-20) 

The rounding eats bytes (not anymore). I have now tweaked both formulas. Some sample outputs:

7.3 325 // 2015 7.3 328 7.4 331 7.5 334 // 2018 8.4 370 // 2030 

They all seem to be accurate.

A tip: Order of execution saves bytes on parentheses. For example: (a-4)/4 = a/4-1 :-).

AutoIt - 60 58 bytes

$_=@YEAR-2e3 ClipPut(($_-Int(($_-4)/4))/10+6&' 3'&3*$_-20) 

The rounding eats bytes (not anymore). I have now tweaked both formulas. Some sample outputs:

7.3 325 // 2015 7.3 328 7.4 331 7.5 334 // 2018 8.4 370 // 2030 

They all seem to be accurate.

AutoIt - 60 58 56 bytes

$_=@YEAR-2e3 ClipPut(($_-Int($_/4-1))/10+6&' 3'&3*$_-20) 

The rounding eats bytes (not anymore). I have now tweaked both formulas. Some sample outputs:

7.3 325 // 2015 7.3 328 7.4 331 7.5 334 // 2018 8.4 370 // 2030 

They all seem to be accurate.

AutoIt - 60 bytes

$_=@YEAR-2e3 ClipPut(($_-Round(($_-6)/4))/10+6&' 3'&3*$_-20) 

The rounding eats bytes. I've also simplified the formula for the US. Output for this year:

7.3 325 

AutoIt - 60 58 bytes

$_=@YEAR-2e3 ClipPut(($_-Int(($_-4)/4))/10+6&' 3'&3*$_-20) 

The rounding eats bytes (not anymore). I have now tweaked both formulas. Some sample outputs:

7.3 325 // 2015 7.3 328 7.4 331 7.5 334 // 2018 8.4 370 // 2030 

They all seem to be accurate.