The usual way to refer to years is to pronounce the first two digits together as one number, and the second two together as another number.
- 2020 -> "twenty-twenty,"
- 2115 -> "twenty-one-fifteen."
2. When a year ends with 01 to 09, then the last two numbers are pronounced O+number
1602 -> Sixteen Oh Two
1600 -> Sixteen Hundred
4. When a year ends with 000 - 009
2000 -> Two thousand
2001 -> Two thousand and one
5. When a year ends with 010 - 020
Both ways are ok:
2010 -> Twenty ten, or Two thousand and ten