Figure 2
The horizontal axis represents “Year” and spans from 2011 to 2023, marked at one-year intervals. The vertical axis shows a numerical index ranging from 1.0 to 2.0, in increments of 0.2 units. Four distinct lines are plotted across the same time period. A legend is placed at the bottom of the chart identifying the four lines as “Qingdao Port”, “Rizhao Port”, “Yantai Port”, and “Shandong Port Cluster”. The “Qingdao Port” line starts at about 1.60 in 2011, rises steadily over time with minor fluctuations, and reaches close to 1.99 by 2023, remaining the highest among the four series throughout the period. The “Rizhao Port” line begins at just above 1.08 in 2011, increases gradually with small ups and downs, and reaches approximately 1.42 by 2023. The “Yantai Port” line starts slightly above 1.07 in 2011, shows a steady upward trend with modest fluctuations, and reaches around 1.36 by 2023, remaining below “Rizhao Port” for most years. The “Shandong Port Cluster” line begins near 1.25 in 2011, rises consistently over the years, and reaches approximately 1.59 by 2023, staying between “Qingdao Port” and the other two individual ports. Note: All numerical data values are approximated.Analysis of international competitiveness differences in Shandong port cluster from 2011 to 2023. Source(s): Authors’ own creation