Move year benchmark into table

Author: maneatingape

README.md

@@ -61,14 +61,16 @@ Performance is reasonable even on older hardware, for example a 2011 MacBook Pro
 
 ![pie-all]
 
-* [2023](#2023) (7 ms)
-* [2022](#2022) (10 ms)
-* [2021](#2021) (10 ms)
-* [2020](#2020) (286 ms)
-* [2019](#2019) (22 ms)
-* [2017](#2017) (in progress)
-* [2016](#2016) (663 ms)
-* [2015](#2015) (87 ms)
+| Year | Benchmark (ms) |
+| --- | --: |
+| [2023](#2023) | 7 |
+| [2022](#2022) | 10 |
+| [2021](#2021) | 10 |
+| [2020](#2020) | 286 |
+| [2019](#2019) | 22 |
+| [2017](#2017) | in progress |
+| [2016](#2016) | 663 |
+| [2015](#2015) | 87 |
 
 ## 2023