data
| Date | L日 | L晚 | L夜 |
|---|---|---|---|
| dB | dB | dB | |
| 2021-Q4 | 53.7 | 48.7 | 49.4 |
| 2021-Q3 | 60.6 | 57.1 | 57.7 |
| 2021-Q2 | 53.9 | 48.9 | 48.7 |
| 2021-Q1 | 55.4 | 47.5 | 43.9 |
| 2020-Q4 | 56.2 | 51.5 | 46.1 |
| 2020-Q3 | 55.5 | 48.5 | 46.7 |
| 2020-Q3 | 53.7 | 47.7 | 48.7 |
| 2020-Q1 | 53.8 | 49.4 | 45.5 |
| 2019-Q4 | 53.2 | 48.7 | 45.0 |
| 2019-Q3 | 54.6 | 51.3 | 49.8 |
| 2019-Q2 | 58.5 | 53.3 | 48.6 |
| 2019-Q1 | 56.4 | 50.1 | 48.2 |
| 2018-Q4 | 58.6 | 50.9 | 48.4 |
| 2018-Q3 | 58.8 | 51.9 | 49.7 |
| 2018-Q2 | 56.7 | 51.8 | 52.1 |
| 2018-Q1 | 58.9 | 49.7 | 49.0 |
| 2017-Q4 | 56.0 | 48.6 | 47.1 |
| 2017-Q3 | 48.7 | 50.6 | 47.2 |
| 2017-Q2 | 50.3 | 43.8 | 44.0 |
| 2017-Q1 | 50.4 | 45.8 | 41.8 |
| 2016-Q4 | 54.4 | 50.7 | 47.6 |
| 2016-Q3 | 54.9 | 50 | 48.4 |
| 2016-Q2 | 53.9 | 51.5 | 47.3 |
| 2016-Q1 | 57.6 | 53.6 | 49.1 |
| 2015-Q4 | 58.5 | 54.7 | 49.4 |
| 2015-Q3 | 58.5 | 53.6 | 49.4 |
| 2015-Q2 | 58.7 | 53.8 | 49.3 |
| 2015-Q1 | 56.8 | 50.4 | 47.4 |
| 2014-Q4 | 53.4 | 45.5 | 45.1 |
| 2014-Q3 | 45 | 52 | 46 |
| 2014-Q2 | 52 | 44 | 48 |
| 2014-Q1 | 47 | 56 | 52 |
| 2013-Q4 | 54.9 | 52.4 | 48.4 |
| 2013-Q3 | 58.3 | 52.7 | 49.8 |
| 2013-Q2 | 59.4 | 53.1 | 49.6 |
| 2013-Q1 | 55.1 | 50.3 | 49.1 |