data
| Date | L日 | L晚 | L夜 |
|---|---|---|---|
| dB | dB | dB | |
| 2021-Q4 | 52.3 | 47.3 | 53.7 |
| 2021-Q3 | 51.7 | 47.8 | 58.4 |
| 2021-Q2 | 57.5 | 50.4 | 52.2 |
| 2021-Q1 | 50.6 | 49.3 | 41.6 |
| 2020-Q4 | 52.1 | 42.5 | 37.7 |
| 2020-Q3 | 54.9 | 42.4 | 46.7 |
| 2020-Q2 | 52.3 | 42.5 | 44.0 |
| 2020-Q1 | 52.1 | 45.5 | 43.7 |
| 2019-Q4 | 50.9 | 46.1 | 48.3 |
| 2019-Q3 | 56.5 | 48.5 | 48.0 |
| 2019-Q2 | 55.1 | 51.4 | 48.9 |
| 2019-Q1 | 55.6 | 54.2 | 45.0 |
| 2018-Q4 | 59.1 | 54.1 | 49.5 |
| 2018-Q3 | 56.7 | 48.7 | 49.2 |
| 2018-Q2 | 58.1 | 58.3 | 54.5 |
| 2018-Q1 | 54.8 | 48.6 | 43.6 |
| 2017-Q4 | 57.7 | 48.3 | 48.4 |
| 2017-Q3 | 55.1 | 52.0 | 49.7 |
| 2017-Q2 | 49.1 | 53.7 | 49.4 |
| 2017-Q1 | 57.0 | 53.1 | 47.6 |
| 2016-Q4 | 57.2 | 51.5 | 47 |
| 2016-Q3 | 55.7 | 49.9 | 51.1 |
| 2016-Q2 | 57.9 | 54.7 | 49 |
| 2016-Q1 | 58.2 | 52.2 | 47.4 |
| 2015-Q4 | 53.7 | 49.8 | 46.7 |
| 2015-Q3 | 58.6 | 47.9 | 48.8 |
| 2015-Q2 | 56.9 | 48.9 | 52.4 |
| 2015-Q1 | 48.0 | 46.6 | 39.6 |
| 2014-Q4 | 55.6 | 53.3 | 51.4 |
| 2014-Q4 | 55.6 | 53.3 | 51.4 |
| 2014-Q3 | 51 | 50 | 52 |
| 2014-Q2 | 52 | 55 | 48 |
| 2014-Q1 | 55 | 49 | 52 |
| 2013-Q4 | 56.4 | 44.7 | 49.4 |
| 2013-Q3 | 59.0 | 46.2 | 49.3 |
| 2013-Q2 | 57.1 | 51.9 | 48.7 |
| 2013-Q1 | 59.2 | 50.0 | 49.0 |