The annual report wants revenue per year and the change against the year before — but the business did not trade every year, and one year's refunds cancelled its sales exactly.

Input

Output

One row per calendar year that has at least one order, with the columns:

• year — 'YYYY' as a string
• revenue — that year's total amount
• prev_revenue — the immediately preceding calendar year's revenue, or null if that year has no orders at all
• yoy_pct — (revenue - prev_revenue) / prev_revenue * 100

Example

Constraints

• The previous calendar year, not the previous row. If 2023 has no orders, 2024 compares against nothing — prev_revenue and yoy_pct are both null, and reaching back to 2022 is wrong.
• A previous year that nets to zero is a real year: prev_revenue is 0.0, but the percentage is undefined, so yoy_pct is null. Not infinity, not zero.
• Row order is not graded. Column names and their order are.