data
| Date | L日 | L晚 | L夜 |
|---|---|---|---|
| dB | dB | dB | |
| 2021-Q4 | 75.7 | 73.3 | 70.2 |
| 2021-Q3 | 75.4 | 71.0 | 69.6 |
| 2021-Q2 | 75.8 | 72.4 | 69.9 |
| 2021-Q1 | 75.4 | 72.3 | 71.0 |
| 2020-Q4 | 75.9 | 72.6 | 70.1 |
| 2020-Q3 | 75.0 | 70.8 | 70.2 |
| 2020-Q2 | 75.5 | 73.2 | 70.8 |
| 2020-Q1 | 75.3 | 72.5 | 69.5 |
| 2019-Q4 | 75.5 | 72.9 | 69.9 |
| 2019-Q3 | 74.5 | 70.4 | 68.3 |
| 2019-Q2 | 76.2 | 74.0 | 70.9 |
| 2019-Q1 | 75.7 | 72.9 | 70.5 |
| 2018-Q4 | 74.9 | 69.4 | 69.5 |
| 2018-Q3 | 74.8 | 69.8 | 69.6 |
| 2018-Q2 | 75.5 | 73.1 | 72.6 |
| 2018-Q1 | 74.5 | 69.6 | 69.6 |
| 2017-Q4 | 75.0 | 69.7 | 69.2 |
| 2017-Q3 | 76.0 | 70.6 | 70.1 |
| 2017-Q2 | 73.6 | 71.3 | 68.1 |
| 2017-Q1 | 69.2 | 67.1 | 63.2 |
| 2016-Q4 | 75.9 | 72.7 | 68.6 |
| 2016-Q3 | 74.7 | 69.3 | 68.9 |
| 2016-Q2 | 72.5 | 67.1 | 64.9 |
| 2016-Q1 | 77.7 | 70 | 65.9 |
| 2015-Q4 | 72.3 | 68.6 | 65.7 |
| 2015-Q3 | 74.8 | 69.6 | 68.9 |
| 2015-Q2 | 73.8 | 71.3 | 66.6 |
| 2015-Q1 | 75.5 | 72.0 | 69.1 |
| 2014-Q4 | 75.7 | 73.0 | 70.0 |
| 2014-Q3 | 75 | 73 | 68 |
| 2014-Q2 | 71 | 68 | 70 |
| 2014-Q1 | 72.7 | 71.0 | 68 |
| 2013-Q3 | 75.3 | 71.2 | 71.2 |
| 2013-Q2 | 75.7 | 72.2 | 67.7 |
| 2013-Q1 | 75.7 | 72.8 | 71.7 |